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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.

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  1. 3.6" 1 item
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  3. 4" 1 item
  4. 4.1" 1 item
  5. 4.6" 1 item
  6. 5" 2 items
Caliber
  1. 9mm 40 items
Category
  1. Pistol parts 257 items
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Configuration
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  3. Gen 5 8 items
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  7. G19 6 items
  8. P320 3 items
  9. P365 2 items
  10. Handgun 2 items
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  6. DLC 20 items
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  8. Gray 1 item
  9. Nitride 6 items
  10. Stainless Steel 1 item
  11. PVD/CVD 2 items
  12. Titanium Nitride (TiN) 11 items
  13. Molecular Dense Coating (MDC) 2 items
Magazine Capacity
  1. 7rd 1 item
  2. 15rd 1 item
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  1. Agency Arms 21 items
  2. Angstadt Arms 1 item
  3. Apex Tactical Specialties 17 items
  4. ARC Division 1 item
  5. Ascalon Arms 1 item
  6. Brügger & Thomet (B&T) 1 item
  7. Battle Arms Development 3 items
  8. Danger Close Armament 5 items
  9. DPM Systems Technologies 7 items
  10. Empire 11 items
  11. Faxon Firearms 4 items
  12. Glock 1 item
  13. GoGun USA 1 item
  14. Grayguns 14 items
  15. Grey Ghost Precision 1 item
  16. Griffin Armament 5 items
  17. Haley Strategic 1 item
  18. HB Industries 1 item
  19. HERA ARMS 1 item
  20. Kagwerks 1 item
  21. Killer Innovations 10 items
  22. Krebs Customs 1 item
  23. L2D Combat 16 items
  24. Lantac 7 items
  25. Lone Wolf Arms 3 items
  26. Midwest Industries 1 item
  27. Mischief Machine 7 items
  28. Next Level Armament 1 item
  29. NIGHT FISION 2 items
  30. Nomad Defense 4 items
  31. Norsso 13 items
  32. Noveske 1 item
  33. Rainier Arms, LLC 7 items
  34. Red Dirt USA 1 item
  35. SCT Manufacturing 1 item
  36. Shalotek 20 items
  37. Shield Arms 1 item
  38. Sig Sauer 16 items
  39. SLR Rifleworks 3 items
  40. Spinta Precision 4 items
  41. Sprinco (Tactical Springs) 1 item
  42. Springer Precision 5 items
  43. Stoeger 1 item
  44. Strike Industries 1 item
  45. Tactical Development 7 items
  46. Taran Tactical Innovations 11 items
  47. Toni Systems 1 item
  48. True Precision 2 items
  49. TXC Holsters 1 item
  50. Tyrant Designs 9 items
  51. Wilson Combat 1 item
  52. Wolff Gunsprings 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 2 items
  5. Glock 17 34 items
  6. Glock 19 43 items
  7. Glock 19X 7 items
  8. Glock 20 5 items
  9. Glock 21 5 items
  10. Glock 22 9 items
  11. Glock 23 10 items
  12. Glock 24 8 items
  13. Glock 25 4 items
  14. Glock 26 10 items
  15. Glock 27 8 items
  16. Glock 28 3 items
  17. Glock 29 4 items
  18. Glock 30 4 items
  19. Glock 31 9 items
  20. Glock 32 9 items
  21. Glock 33 8 items
  22. Glock 34 14 items
  23. Glock 35 10 items
  24. Glock 36 2 items
  25. Glock 37 5 items
  26. Glock 38 6 items
  27. Glock 39 5 items
  28. Glock 40 4 items
  29. Glock 41 4 items
  30. Glock 42 4 items
  31. Glock 43 8 items
  32. Glock 43X 8 items
  33. Glock 44 4 items
  34. Glock 45 7 items
  35. Glock 48 11 items
  36. H&K P2000 2 items
  37. H&K P30 2 items
  38. H&K VP9 1 item
  39. Nomad 9 2 items
  40. Sig P22X 2 items
  41. Sig P220 2 items
  42. Sig P226 3 items
  43. Sig P228 2 items
  44. Sig P229 2 items
  45. Sig P238 1 item
  46. Sig P320 52 items
  47. Sig P365 22 items
  48. Sig P365X 5 items
  49. Sig P365XL 11 items
  50. Sig P365 X-Macro 1 item
  51. Sig MPX 1 item
  52. S&W M&P 1 item
  53. S&W M&P M2.0 1 item
  54. S&W M&P Shield 2 items
  55. Springfield Hellcat 1 item
  56. Stoeger STR-9 1 item
  57. Walther PPQ 2 items
Mount
  1. M-LOK 1 item
  2. Picatinny 2 items
Optic Footprint
  1. Holosun 407K/507K 1 item
  2. Shield RMSc 5 items
  3. Trijicon RMR 2 items
Option
  1. V1 1 item
  2. V2 1 item
  3. V3 1 item
  4. CZ 8 items
  5. FNH 3 items
  6. Glock 55 items
  7. Heckler & Koch 1 item
  8. Sig Sauer 27 items
  9. Smith & Wesson 2 items
  10. Springfield 1 item
  11. Walther 2 items
  12. Glock 17 1 item
  13. Right-Hand 1 item
  14. Left-Hand 1 item
Platform
  1. CZ 6 items
  2. FNH 2 items
  3. Glock 97 items
  4. H&K 3 items
  5. Sig Sauer 94 items
  6. Smith & Wesson 4 items
  7. Springfield 5 items
  8. Stoeger 1 item
  9. Walther 2 items
Product Type
  1. Accessory 3 items
  2. Basepad 4 items
  3. Charging Handle 2 items
  4. Compensator 8 items
  5. Connector 1 item
  6. Extended Slide Stop 1 item
  7. Grip Accessory 1 item
  8. Grip Module 15 items
  9. Guide Rod 7 items
  10. Handgun Barrel 36 items
  11. Handgun Sights 1 item
  12. Holster 1 item
  13. Iron Sight 1 item
  14. Locking Block 1 item
  15. Magazine 3 items
  16. Magazine Accessory 2 items
  17. Magazine Catch 1 item
  18. Magazine Extension 1 item
  19. Magazine Release 5 items
  20. Magwell 14 items
  21. Muzzle Device Accessory 2 items
  22. Optic Plate 2 items
  23. Parts Kit 2 items
  24. Pistol Accessory 1 item
  25. Pistol Frame 18 items
  26. Pistol Part 22 items
  27. Pistol Sights 9 items
  28. Recoil Spring 6 items
  29. Red Dot Mount 1 item
  30. Safety Selector 1 item
  31. Sled Feet 1 item
  32. Slide 53 items
  33. Slide Parts Kit 2 items
  34. Spring 2 items
  35. Top Cover 1 item
  36. Trigger 26 items
  37. Upper Parts Kit 2 items
Size
  1. Small 2 items
  2. Large 1 item
  3. 3 Slot 1 item
  4. 5 Slot 1 item
  5. 9 Slot 1 item
  6. X-Compact 2 items
  7. Compact 1 item
  8. Full 2 items
Thread Pitch
  1. 1/2x28 (9mm) 24 items
Threaded
  1. Yes 1 item
  2. No 3 items
Twist Rate
  1. 1:10 23 items
Stock Status
  1. Out of stock 264 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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