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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.

Parts

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  1. Arms Republic 9mm Compensator for CZ P-10 - Black
    Arms Republic 9mm Compensator for CZ P-10 - Black
    $59.95
    Out of stock
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  2. Rainier Arms Exclusive Danger Close Armament DCA-320 Select Match 9mm Barrel For Sig P320 - (3.9")
    Danger Close Armament DCA-320 Select Match 9mm Barrel For Sig P320 - (3.9")
    Out of stock
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  3. Faxon Firearms Match Series Sig Sauer P365XL 9mm Threaded Barrel
    Faxon Firearms Match Series Sig Sauer P365XL 9mm Threaded Barrel
    Out of stock
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  4. Tyrant Designs Magwell For Polymer 80 - Black w/ Gold Screw
    Tyrant Designs Magwell For Polymer 80 - Black w/ Gold Screw
    $62.95
    Out of stock
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  5. Rainier Arms Exclusive Nomad Defense Hybrid Frame Parts Kit for Glock Gen 4/5
    Nomad Defense Hybrid Frame Parts Kit for Glock Gen 4/5
    $85.00
    Out of stock
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  6. Sig Sauer X-RAY3 Day/Night Sights
    Sig Sauer X-RAY3 Day/Night Sights
    $99.99
    Out of stock
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  7. Faxon Firearms EXOS-513 Pistol Compensator for Glock and FX-19
    Faxon Firearms EXOS-513 Pistol Compensator for Glock and FX-19
    $78.20
    Out of stock
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  8. Faxon Firearms EXOS-515 Pistol Compensator for Sig Sauer P320
    Faxon Firearms EXOS-515 Pistol Compensator for Sig Sauer P320
    $78.20
    Out of stock
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  9. Rainier Arms Exclusive Nomad Defense Magwell Extension and Backstrap Combo - 9F Frame
    Nomad Defense Magwell Extension and Backstrap Combo - 9F Frame
    $79.00
    Out of stock
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  10. Rainier Arms Exclusive Danger Close Armament DCA-365 Select Match 9mm Threaded Barrel For Sig P365 - (3.1")
    Danger Close Armament DCA-365 Select Match 9mm Threaded Barrel For Sig P365 - (3.1")
    Out of stock
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  11. Rainier Arms Exclusive Danger Close Armament DCA-365 Select Match 9mm Barrel For Sig P365 - (3.1")
    Danger Close Armament DCA-365 Select Match 9mm Barrel For Sig P365 - (3.1")
    Out of stock
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  12. Rainier Arms Exclusive Danger Close Armament DCA-X5 Select Match 9mm Barrel For Sig P320 X-Five - (5")
    Danger Close Armament DCA-X5 Select Match 9mm Barrel For Sig P320 X-Five - (5")
    Out of stock
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  13. Apex Tactical Specialties M&P 2.0 Flat Face Forward Set Trigger Kit - Black
    Apex Tactical Specialties M&P 2.0 Flat Face Forward Set Trigger Kit - Black
    $104.50
    Out of stock
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  14. Agency Arms Sig P320 Dual Port Compensator - Black
    Agency Arms Sig P320 Dual Port Compensator - Black
    $100.00
    Out of stock
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  15. Apex Tactical Specialties Springfield Hellcat Action Enhancement Trigger - Red
    Apex Tactical Specialties Springfield Hellcat Action Enhancement Trigger - Red
    $85.50
    Out of stock
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  16. Norsso Sig Sauer P320C Reptile Ported RMR Slide - Black DLC
    Norsso Sig Sauer P320C Reptile Ported RMR Slide - Black DLC
    $436.05
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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.

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  1. 3.6" 1 item
  2. 3.7" 2 items
  3. 3.9" 2 items
  4. 4" 1 item
  5. 4.57" 1 item
  6. 5" 1 item
Barrel Profile
  1. SDM 1 item
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  1. 9mm 27 items
Category
  1. Pistol parts 222 items
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  1. Flat 1 item
  2. Gen 3 2 items
  3. Gen 5 2 items
  4. G17 1 item
  5. G19 7 items
  6. P320 3 items
  7. P365 2 items
  8. P365XL 1 item
  9. Handgun 2 items
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  2. Black 3 items
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  4. Black DLC 2 items
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  10. DLC 16 items
  11. Gold 2 items
  12. Gray 1 item
  13. Melonite 1 item
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  15. Stainless Steel 1 item
  16. Anodize 2 items
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  18. Titanium Nitride (TiN) 10 items
Is Firearms?
  1. No 229 items
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  1. 7rd 1 item
  2. 15rd 1 item
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  1. Agency Arms 18 items
  2. Angstadt Arms 1 item
  3. Apex Tactical Specialties 22 items
  4. ARC Division 1 item
  5. Arms Republic 3 items
  6. Ascalon Arms 1 item
  7. Brügger & Thomet (B&T) 1 item
  8. Battle Arms Development 3 items
  9. Danger Close Armament 5 items
  10. DPM Systems Technologies 4 items
  11. Empire 6 items
  12. Faxon Firearms 7 items
  13. Glock 1 item
  14. GoGun USA 1 item
  15. Grayguns 4 items
  16. Griffin Armament 3 items
  17. Haley Strategic 1 item
  18. HB Industries 4 items
  19. HERA ARMS 1 item
  20. Killer Innovations 4 items
  21. L2D Combat 16 items
  22. Lantac 10 items
  23. Midwest Industries 1 item
  24. Mischief Machine 5 items
  25. Next Level Armament 1 item
  26. Nomad Defense 4 items
  27. Norsso 8 items
  28. Rainier Arms, LLC 6 items
  29. Shalotek 19 items
  30. Sharps Bros 2 items
  31. Sig Sauer 12 items
  32. SLR Rifleworks 3 items
  33. Spinta Precision 3 items
  34. Springer Precision 5 items
  35. Stoeger 1 item
  36. Tactical Development 8 items
  37. Taran Tactical Innovations 12 items
  38. Trinity Nevada 1 item
  39. True Precision 1 item
  40. TXC Holsters 1 item
  41. Tyrant Designs 12 items
  42. Wilson Combat 1 item
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  1. CZ Scorpion 1 item
  2. CZ Shadow 1 item
  3. CZ P-10 5 items
  4. FNH 509 4 items
  5. FNH FNX-45 1 item
  6. Glock 17 21 items
  7. Glock 19 33 items
  8. Glock 19X 5 items
  9. Glock 20 3 items
  10. Glock 21 3 items
  11. Glock 22 9 items
  12. Glock 23 8 items
  13. Glock 24 6 items
  14. Glock 25 3 items
  15. Glock 26 8 items
  16. Glock 27 7 items
  17. Glock 28 3 items
  18. Glock 29 3 items
  19. Glock 30 3 items
  20. Glock 31 8 items
  21. Glock 32 7 items
  22. Glock 33 7 items
  23. Glock 34 10 items
  24. Glock 35 8 items
  25. Glock 36 1 item
  26. Glock 37 3 items
  27. Glock 38 3 items
  28. Glock 39 3 items
  29. Glock 40 3 items
  30. Glock 41 3 items
  31. Glock 42 1 item
  32. Glock 43 4 items
  33. Glock 43X 5 items
  34. Glock 44 3 items
  35. Glock 45 5 items
  36. Glock 48 7 items
  37. H&K VP9 1 item
  38. Nomad 9 4 items
  39. Sig P220 1 item
  40. Sig P226 1 item
  41. Sig P229 1 item
  42. Sig P238 1 item
  43. Sig P320 50 items
  44. Sig P365 19 items
  45. Sig P365X 3 items
  46. Sig P365XL 11 items
  47. Sig P365 X-Macro 1 item
  48. Sig P938 1 item
  49. Sig MPX 1 item
  50. S&W M&P 1 item
  51. S&W M&P M2.0 3 items
  52. S&W M&P Shield 3 items
  53. Springfield Hellcat 1 item
  54. Stoeger STR-9 1 item
Mount
  1. M-LOK 1 item
  2. Picatinny 2 items
Optic Footprint
  1. Shield RMSc 6 items
  2. Trijicon RMR 1 item
Option
  1. Safety 2 items
  2. No Safety 2 items
  3. Sig Sauer P Series 1 item
  4. CZ 9 items
  5. FNH 5 items
  6. Glock 51 items
  7. Sig Sauer 28 items
  8. Smith & Wesson 4 items
  9. Springfield 1 item
  10. Right-Hand 1 item
  11. Left-Hand 1 item
Platform
  1. Beretta 1 item
  2. CZ-USA 6 items
  3. FNH 5 items
  4. Glock 70 items
  5. H&K 1 item
  6. Nomad 2 items
  7. Sig Sauer 81 items
  8. Smith & Wesson 6 items
  9. Springfield 2 items
  10. Stoeger 1 item
Price
  1. $0.00 - $999.99 228 items
  2. $1,000.00 and above 1 item
Product Type
  1. Accessory 4 items
  2. Barrel 29 items
  3. Basepad 3 items
  4. Charging Handle 2 items
  5. Compensator 16 items
  6. Extended Slide Stop 1 item
  7. Firing Pin 1 item
  8. Grip Accessory 1 item
  9. Grip Module 8 items
  10. Guide Rod 3 items
  11. Holster 1 item
  12. Iron Sight 1 item
  13. Locking Block 1 item
  14. Magazine 3 items
  15. Magazine Extension 3 items
  16. Magazine Release 6 items
  17. Magwell 15 items
  18. Muzzle Device Accessory 2 items
  19. Optic Plate 1 item
  20. Parts Kit 3 items
  21. Pistol Accessory 1 item
  22. Pistol Frame 10 items
  23. Pistol Part 15 items
  24. Pistol Sights 9 items
  25. Recoil Spring 3 items
  26. Safety Selector 1 item
  27. Slide 46 items
  28. Slide Parts Kit 3 items
  29. Spring 1 item
  30. Top Cover 1 item
  31. Trigger 23 items
  32. Upper Parts Kit 2 items
Size
  1. 3 Slot 1 item
  2. 5 Slot 1 item
  3. 9 Slot 1 item
  4. X-Compact 2 items
  5. Full 1 item
Thread Pitch
  1. 1/2x28 14 items
Threaded
  1. Yes 4 items
  2. No 5 items
Twist Rate
  1. 1:10 6 items
Stock Status
  1. Out of stock 229 items Remove This Item
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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.

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