Common Barrel Thread Patterns

It can be very difficult keeping track of all the different thread patterns for all the various gun barrels on the market today. Below is a reference guide for the some of the more common thread patterns for factory shipped barrels. These patterns may not apply to aftermarket barrels or if you had the barrel threaded yourself.

Here are some abbreviations used in explaining thread patterns:
M=Metric (M13.5X1 means these numbers are metric instead of standard)
LH=Left Hand (M13.5X1 LH means the thread pattern is backwards and threads on the opposite direction)
RH=Right Hand (M16X1 RH means the thread pattern should be the same as usually expected)
TPI=Threads Per Inch

.22LR, .22MAG, .17HMR
1/2×28 is typically the standard thread for these calibers

9mm
1/2×28 is typically the most common thread for 9mm weapons, with the following exceptions:

  • H&K: M13.5×1 LH
  • Sig Sauer (MPX): M13.5×1 LH
  • Glock: M13.5×1 LH
  • Factory H&K MP5-N: 1/2-30

.40 S&W
9/16×24 is typically the most common thread for .40 S&W weapons with the following exceptions:

  • H&K: M14.5×1 LH
  • Sig Sauer: M13.5×1 LH
  • Glock: M14.5×1 LH

.45 ACP
.578×28 is the most common thread for .45 ACP weapons with the following exceptions:

  • H&K: M14.5×1 LH
  • H&KUSP Tactical: M16x1 LH
  • H&K Mark 23 (Socom): M16x1 RH
  • Glock: M16x1 LH
  • KRISS Vector SMG: M16x1 LH
  • Sig Sauer P220: .578”-28

.223/5.56 NATO
1/2×28 is the most common tread pattern for most AR-15s. However, there are some exceptions:

  • Steyr Aug: M13x1 LH
  • H&K: M15x1
  • Ruger Mini: 9/16×24

.308/7.62mm
5/8×24 is the most common tread pattern. However, there are some exceptions:

  • SakoTRG: M18x1
  • Accuracy International: M18x1.5
  • AK-47: M14x1 LH
  • FN SCAR 17: 5/8×24
  • Springfield M1A SOCOM 16:  .595×32

.338 Lapua Magnum
5/8×24 is the most common thread pattern. However, there are some exceptions:

  • SakoTRG: M18x1
  • Accuracy International: M18x1.5
  • Desert Tactical Arms: 3/4×24
  • Barrett MRAD: 3/4×24
  • Nemo Omen (.300 Win Mag): 5/8×24

.50 BMG

  • McMillian TAC-50: 1” x 14 TPI
  • Armalite AR50: 1” x 14 TPI
  • Barrett: 7/8” x 14 TPI
  • EDM: 7/8” x 14 TPI

Modern Warriors
JUST A GROUP OF GUYS WHO SUPPORT THE 2ND AMENDMENT

We started Modern Warriors and Alice Firearms for the sole purpose of providing a less expensive way to enjoy our love of buying and shooting some really cool stuff. What started as a hobby has turned into a business where we have developed the experience and ability to help you enjoy our same hobby and save you money in the process.

We specialize in tactical weapons, including suppressors, short barrel rifles and full auto weapons. We have routine experience in shooting the weapons we carry, so if you want our opinion on how a weapon operates, we will gladly provide it. We also have expertise working with licensed professionals in setting up gun trusts, which is an ideal way of purchasing, owning and operating any weapon restricted by the National Firearm Act. Don’t let the word “trust” scare you. It is very easy to set one up if you have the right help.

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