Frequently Asked Questions

Know the 4 of firearm safety

Will +P ammo work in my weapon?

What's the difference in 7.62 and 308WIN?

What is NATO?

How to store ammo?

What is sub-soninc?

Difference in Standard and Magnum primers

What is MOA?

What is barrel break-in?

Should I fire corrosive ammunition?

What does a muzzlebreak do?

What is DA/SA?

What is twist rate?

What impacts bullet stability? 

What is BC and LD?

Should I lubricate my weapon?

How often should I service my weapon?

Can I dry fire my weapon?

Sig Mosquito issues

Do Glocks have a safety?

Where can I find ballistics info?

Will 9MM work for a carry round?

Know and follow the 4 rules of firearm safety:

- Treat all firearms as if they are loaded

- Never point the muzzle at anything you're not willing to destroy

- Keep your finger off the trigger until your sights are on the target and you're ready to fire

- Be sure of your target and what's beyond it

1) Will +P run in my weapon?

- Please refer to the owners manual for your weapon. Please also contact your manufacturer to ensure the correct ammunition is used for your weapon.

- Glock suggests using ammunition that is manufactured and meets SAAMI or industry specifications. If you are not sure the ammunition brand or type you choose is safe for use, call the ammunition manufacturer and ask if the product meets SAAMI guidelines before using it in you firearm. Some +P ammunition meets these guidelines, +P+ normally does not. This ammunition may generate a higher pressure over the standard loadings, and may shorten the component life of your firearm. - -

- +P Ammo manufactured to SAAMI/CIP/NATO specs is fine to use as a defensive round or for occasional range use. Continual use of this round will make it necessary for more frequent service on the pistol. We do NOT recommend the use of any +P+ round. This may void your warranty. - -

2) What is the difference in 7.62 and 308 Win?

- Although not identical, the 7.62×51mm NATO and the commercial .308 Winchester cartridges are similar enough that they can be loaded into rifles chambered for the other round, but the Winchester .308 cartridges are typically loaded to higher pressures than 7.62×51mm NATO cartridges. Even though the Sporting Arms and Ammunition Manufacturers' Institute (SAAMI) does not consider it unsafe to fire the commercial round in weapons chambered for the NATO round, there is significant discussionabout compatible chamber and muzzle pressures between the two cartridges based on powder loads and wall thicknesses on the military vs. commercial rounds. While the debate goes both ways, the ATF recommends checking the stamping on the barrel; if one is unsure, one can consult the maker of the firearm. - -

3) What does NATO mean with regards to ammunition?

- NATO spec. means military standard ammo. This ammunition is frequently loaded to higher pressure than civilian ammo. The majority of consumer civilian ammunition is slightly download to protect people from shooting higher powered ammo in older and sometime guns in poor condition. - -

4) How should I store ammunition?

- Heat and humidity are the real enemy of stored ammunition. Ammunition should ideally be stored in a cool, dry controlled environment where there are no unusual variations in temperature and humidity. Cold has no adverse effects on ammunition, however, extreme high temperatures, such as those found in the trunk of a car, a storage shed or an attic should be avoided for long term storage. We also recommend that you store the ammunition in it's original carton to aid you in identifying the ammunition at a later date. If you desire to store a larger quantity of ammunition you may wish to invest in good quality ammunition cans. The number one enemy is moisture so it may be wise to add moisture absorbing desiccant packs and put them in the container with the ammo. Keep the container off of concrete floors and it is best to store on a shelf between the floor and ceiling for the most controlled temperatures and humidity levels. Before you store it make sure its clean, dry. Always wipe [oils] off the cartridges as the acids, salts and other chemicals contained in [oils] can cause corrosion, which could affect the reliability of the cartridge. Cartridges should not be submerged in water or exposed to any solvents, petroleum products (including gun oil), bore cleaner ammonia or other chemicals. These materials can penetrate a cartridge and cause the primer or powder to deteriorate. Properly stored ammunition will last for many decades. Finally, we recommend that you change out the ammunition in your defensive handgun every two to three months with fresh rounds. Take advantage by using these defense rounds to practice your proficiency at the range, as sometimes they impact differently than your traditional practice rounds, such as FMJ projectiles. - -

5) What is the definition of "subsonic"?

-Subsonic ammunition is limited to velocities below the speed of sound. The speed of sound, also known as Mach 1, changes throughout the atmosphere based on the temperature at any given altitude. Probably the most important value to remember, however, is the speed of sound at sea level. Based on the standard atmospheric model, this value has been defined to be
• 1,116.4 ft/s
• 340.3 m/s
• 761.2 mph
• 1,225.1 km/h
• 661.5 knots

Bullets that move through the transonic range to go supersonic (exceeding the speed of sound) create much more noise in flight due to a shock wave created by supersonic flight through air. - -

6) What's the difference in "standard" and "magnum" primers?

- A magnum primer provides a longer flame duration, a higher flame temperature, or both. Use magnum primers only where recommended in published load data. Substituting a magnum primer for a standard one without a charge adjustment will nearly always increase pressures. They are a plus when you are shooting in temperatures below 20 degrees F. - -

7) What is MOA?

- MOA is the abbreviation for minute of angle. There are 360 degrees of angle in a full circle. Each of these degrees can be further divided into 60 minutes of angle. Defined loosely, the angle of one MOA equals one inch at 100 yards. If you were to extend this angle to 1,000 yards, one MOA would be 10 inches. (Without getting into geometry, but to satisfy inquiring minds, the true MOA at 100 yards is 1.0476 inches, or 10.476 inches at 1,000 yards.) - -

8) What is barrel break-in and why is there so much debate around this?

- A procedure frequently overlooked by new rifle owners is completing a thorough barrel break-in. When new barrels are made, steel is unevenly stressed and microscopic burs and rough-spots are created. Hand-lapping new barrels certainly help with those burs and rough-spots, but there is nothing like putting rounds through them to relieve stress and put the final polish on the bore.

Our recommended procedure calls for about 30 rounds and plenty of time spent cleaning the bore, and takes most shooters the better part of a day at the range to complete. However, this hard work results in a barrel that shoots better, and is significantly faster and easier to clean over its working life. - -

- In the simplest terms, break-in is the process of smoothing out the rough edges and tool marks left in a barrel's bore. Depending on manufacturing methods, a bore may be mirror-slick when you receive it, or it may be a few grits shy of 250 on the sandpaper scale. Firing projectiles through a rough barrel—which starts in the leade or free-bore section prior to rifling—leaves microscopic pieces of jacket deposited throughout the bore. The more rounds fired over the rough inner barrel, the more difficult it becomes to remove copper and powder fouling. If these deposits are not removed, you're left with a heavily diminished potential for decent accuracy.

Talking to the gurus solidified a notion I've had for many years: There is no single right way to break-in a new barrel. Since manufacturing methods are out of our hands when using finished barrels, we must learn to read the signs each one provides when new. As a copper or other gilding-metal-jacketed projectile moves through a rough bore, it actually provides an element of lapping action. If this material is removed before continuing to fire, the lapping process continues until the rough surfaces are polished smooth.

The important thing to remember here is that in the first few rounds it's critical to shoot, scrub and patch the bore and chamber clean after each round. While doing so, observe the level of copper fouling and degree of cleaning needed to remove it. In many cases, the process can be done in a few rounds, but occasionally I'll come across a barrel that doesn't see full break-in until 80 to 100 rounds have been through it. - -

9) Should I fire corrosive ammunition?

- Absolutely not. This can damage your firearm. Damage due to firing corrosive ammunition is easy to detect and is not covered under the warranty agreement. However, if you have been forced by necessity or have accidentally fired corrosive ammunition, the following specialized cleaning procedure applies: As soon as possible after firing the corrosive ammunition, thoroughly scrub the bore and bolt face with very hot soapy water. The soapy water will neutralize the salts which attract oxygen to the steel surface. When the metal is clean, rinse the surfaces with very hot water. Wipe off excess moisture. (The residual heat in the metal will evaporate moisture.) Continue cleaning the rifle using procedures specified for noncorrosive ammunition. Or, if temporary transportation or storage is necessary, coat all surfaces with rust preventive or light oil. - -

10) What does a muzzlebreak do?

- A muzzle brake reduces recoil. Your large-caliber rifle was designed to always be fired with the factory installed muzzle brake. Never fire your rifle without the muzzle brake or with an aftermarket muzzle brake. - -

11) What is DA/SA (Double Action/Single Action) mean with regards to firearms?

- Single Action - the earliest and mechanically simplest of trigger types. It is called the "single-action" because it performs the single action of releasing the hammer or striker to discharge the firearm each time the trigger is pulled, while the hammer must be cocked by separate means.[1]

- DA/SA - Double Action/Single Action - combines the features of both mechanisms. This action type is also known as traditional double-action (TDA).

The term "DA/SA" typically denotes a semi-automatic, while in a revolver, "double action" generally means a weapon combining the ability to fire both double- and single-action, as opposed to a plain single-action revolver.

In simple terms, "double-action" refers to a gun trigger mechanism that both cocks the hammer and then releases the sear, thus performing two actions, hence double action. However, although "double action" actually refers to a gun that cocks and releases the hammer with a trigger pull, in practice, most "double action" guns feature both single- and double-action abilities. This is opposed to "DAO" or "Double Action Only" firearms, which lack the ability to fire in single-action mode.

- Double Action Only (DAO) - a design which either has no internal sear mechanism capable of holding the hammer or striker in the cocked position (semi-automatics), or has the entire hammer shrouded and/or has the thumb spur machined off, preventing the user from cocking it (revolvers).

This design requires a trigger pull to both cock and trip the hammer/striker for every single shot, unlike a DA/SA, which only requires a double-action trigger pull for the first shot (or a typical DA/SA revolver, which can fire single action any time the user wishes, but uses double-action as a default). This means that there is no single-action function for any shot, and the hammer or striker always rests in the down position until the trigger pull begins. With semi-automatics, this means that unlike DA/SA weapons, the hammer does not remain cocked after the first round is fired, and every shot is in double-action mode. With revolvers, this means that one does not have the option of cocking the gun before shooting, and must always shoot it in da mode. - -

12) What is twist rate and how does it impact accuracy?

- Twist- the rate of spiral of the rifling. Given as the barrel length required for making one full revolution: i.e., “one turn in ten inches,” etc. Nosler Reloading Guide #6, November 2007

The rate of twist affects which bullets are the most stable in flight. This then determines the best accuracy for your rifle.

* It is important to note that the rate of twist is determined by the cartridge developer and is usually at the optimum twist rate for stability. - -

13) What are the primary factors regarding bullet stability?

  • Twist rate (the distance in which the bullet makes one complete revolution in the barrel)
  • Bullet length
  • Velocity
  • Air density


14) What is B.C. & what does it mean on the ballistic charts?

- B.C. stands for ballistic coefficient.

Ballistic Coefficient (BC) is the ratio of a bullets sectional density to its coefficient of form, used to describe the bullets effectiveness in overcoming air resistance.
Nosler Reloading Guide: fifth edition. USA: 2002 - -

- Further, what is Low Drag?


15) Should I lubricate my weapon?

- YES! All firearms require lubrication. Please follow your owner’s manual for instructions on proper lubrication. SIG SAUER recommends that you use lubricants specifically designed for firearms applications. - -

16) How often should I service my pistol?

- [Sig Sauer] recommend a service interval of once per year or every 5,000 rounds which ever comes first. This keeps your pistol in top operational readiness and is the same standard [Sig Sauer] recommend to all law enforcement customers. - -

17) Can I dry fire my pistol?

- It is ok to dry fire your Glock pistol, but in situations where the pistol will be subjected to continuous sessions of dry firing, the use of a snap cap or dummy round is recommended. - -

- It is safe to dry-fire our center fire pistols. You would want to use a snap cap or plug if extensive dry-firing is done. Always count your dry-firing in your live fire count to be sure all springs and pins are in top condition. DO NOT intentionally dry-fire any rim fire pistol such as the Mosquito, .22LR conversions or Classic Pistols. - -

18) My mosquito pistol seems to have problems ejecting & extracting?

- Please try these basic trouble shooting tips before requesting service: *Please make sure the recoil spring is installed correctly. The narrow end of the spring MUST be on the guide rod first…pointing towards the rear of the gun. If it is not, this will cause feeding, extraction and firing issues. *Like many .22 LR’s, Mosquito’s can be sensitive to ammunition used and to cleanliness and lubrication. Be sure your Mosquito is cleaned and lubricated regularly and before the first use. *There is a lubrication port on the right side of the slide for the extractor, be sure you add a drop of lube in this hole every hundred rounds or so. Make sure the gun is very clean. *Some Mosquito’s benefit from a break-in period. *Be sure to use factory recommend ammunition – CCI Mini-Mags. Winchester Super-X, Remington Golden Bullet, Federal High Velocity etc…also usually work well. - -

19) Do Glocks have a safety?

- Yes, GLOCK pistols are equipped with the “Safe Action”® System, a fully automatic safety system consisting of three passive, independently operating, mechanical safeties, which sequentially disengage when the trigger is pulled and auto-matically reengage when the trigger is released. (Trigger Safety, Firing Pin Safety and Drop Safety) - -

20) Where can I find ballistics information?









21) Will 9MM work for a carry round?

- I'm hearing that with the advancements/evolution of the 9mm round in the last 5 or 10 years it will work just fine for a carry round. Please check out some of our product offerings to see what options are available for your 9mm. 3 large branches of the government have switched back to 9mm. I will research and bring more information back.

- Lucky Gunner: Handgun Self-Defense Ammunition Ballistics Test

- Calibers for Beginners: What you need to know about 9MM