Parts
Our amazing offer consists of a great variety of AR-10, AR-15, and pistol parts and accessories. Purchase upper receivers, muzzle devices, handguards, BCG, barrels, triggers, magazine extensions, etc., and start modifying your firearm today.
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Firearm parts
Rainier Arms is the best place to purchase parts and accessories for your rifle or pistol online, and all that for more than affordable prices. Look no further, you can find here everything that comes to your mind and more! The best manufacturers in the business, like Killer Innovations, Lantac, Next Level Armament, Rainier Arms LLC, Apex Tactical Specialties, and many more are here to offer you their high-quality products. Select your preferred part and make your AR-10, AR-15 or pistol a unique piece of firearm.
- Caliber 9mm Remove This Item
- Agency Arms 19 items
- Arms Republic 4 items
- Battle Arms Development 1 item
- Danger Close Armament 2 items
- Faction 1 item
- Faxon Firearms 16 items
- Fortis MFG 2 items
- Forward Controls Design 2 items
- Grey Ghost Precision 3 items
- Griffin Armament 5 items
- HB Industries 1 item
- Killer Innovations 21 items
- L2D Combat 2 items
- Lantac 3 items
- Lone Wolf Arms 2 items
- Nighthawk Custom 3 items
- Nomad Defense 3 items
- Norsso 5 items
- Noveske 3 items
- Radian Weapons 2 items
- SCT Manufacturing 2 items
- Shalotek 2 items
- Sharps Bros 2 items
- Spinta Precision 1 item
- Strike Industries 2 items
- Trinity Nevada 4 items
- True Precision 27 items
- Tyrant Designs 3 items
- Zaffiri Precision 2 items
- CZ P-10 3 items
- Glock 17 25 items
- Glock 19 43 items
- Glock 19X 3 items
- Glock 23 1 item
- Glock 26 5 items
- Glock 34 4 items
- Glock 43 9 items
- Glock 43X 1 item
- Glock 45 3 items
- Glock 47 1 item
- Glock 48 4 items
- Glock 49 1 item
- Sig P320 21 items
- Sig P365 10 items
- Sig P365-FUSE 2 items
- Sig P365X 2 items
- Sig P365XL 8 items
- Sig P365 X-Macro 3 items
- S&W M&P Shield 2 items
- Springfield Hellcat 4 items
- Springfield Hellcat Pro 2 items
What are the most common barrel thread patterns for pistols and rifles?
For .22LR, .22MAG, .17HMR, 9mm, and .223/5.56 NATO the most common thread pattern would be 1/2x28, with some exceptions for 9mm and .223/5.56 NATO firearms. As for .308/7.62mm and .338 Lapua Magnum, the thread pattern that is most commonly used is 5/8x24, with a few exceptions. Another typical thread pattern is 9/16x24 and it is mostly used for .40 S&W weapons.
Single triggers or two-stage triggers?
Whichever you choose, you cannot go wrong. The single trigger is fast and simple to use; as soon as you apply a small amount of pressure, the firearm goes off. Two-stage trigger is extremely accurate and you know precisely when the shot is going to be fired. The first stage prepares you for the second one, when the trigger pushes the hammer up causing the firearm to discharge. So, it is up to you to make a choice.
