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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 41 items
Category
  1. Pistol parts 253 items
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  2. Gen 5 8 items
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  4. G17 3 items
  5. G19 6 items
  6. P320 3 items
  7. P365 2 items
  8. 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
Manufacturer
  1. Agency Arms 21 items
  2. Angstadt Arms 1 item
  3. Apex Tactical Specialties 17 items
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  6. Brügger & Thomet (B&T) 1 item
  7. Battle Arms Development 3 items
  8. Danger Close Armament 5 items
  9. DPM Systems Technologies 11 items
  10. Empire 12 items
  11. Faxon Firearms 4 items
  12. Glock 1 item
  13. GoGun USA 1 item
  14. Grayguns 9 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 9 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 1 item
  30. Nomad Defense 1 item
  31. Norsso 14 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. Tactical Development 7 items
  45. Taran Tactical Innovations 11 items
  46. Toni Systems 1 item
  47. True Precision 2 items
  48. TXC Holsters 1 item
  49. Tyrant Designs 9 items
  50. Wilson Combat 1 item
  51. Wolff Gunsprings 1 item
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  1. CZ Scorpion 1 item
  2. CZ Shadow 1 item
  3. CZ P-10 6 items
  4. FNH 509 2 items
  5. Glock 17 31 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 11 items
  12. Glock 24 8 items
  13. Glock 25 5 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 10 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. Sig P226 1 item
  40. Sig P320 52 items
  41. Sig P365 21 items
  42. Sig P365X 4 items
  43. Sig P365XL 11 items
  44. Sig P365 X-Macro 1 item
  45. Sig MPX 1 item
  46. S&W M&P 1 item
  47. S&W M&P M2.0 1 item
  48. S&W M&P Shield 2 items
  49. Springfield Hellcat 1 item
  50. Stoeger STR-9 1 item
  51. 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 52 items
  7. Heckler & Koch 1 item
  8. Sig Sauer 23 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 7 items
  2. FNH 2 items
  3. Glock 97 items
  4. H&K 3 items
  5. Sig Sauer 89 items
  6. Smith & Wesson 4 items
  7. Springfield 5 items
  8. Staccato 1 item
  9. Stoeger 1 item
  10. Walther 2 items
Product Type
  1. Accessory 3 items
  2. Basepad 4 items
  3. Charging Handle 3 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 6 items
  10. Handgun Barrel 37 items
  11. Holster 1 item
  12. Iron Sight 1 item
  13. Locking Block 1 item
  14. Magazine 3 items
  15. Magazine Accessory 1 item
  16. Magazine Catch 1 item
  17. Magazine Extension 1 item
  18. Magazine Release 5 items
  19. Magwell 14 items
  20. Muzzle Device Accessory 2 items
  21. Optic Plate 2 items
  22. Pistol Accessory 1 item
  23. Pistol Frame 18 items
  24. Pistol Part 20 items
  25. Pistol Sights 9 items
  26. Recoil Spring 9 items
  27. Red Dot Mount 1 item
  28. Safety Selector 1 item
  29. Sled Feet 1 item
  30. Slide 52 items
  31. Slide Parts Kit 2 items
  32. Spring 2 items
  33. Top Cover 1 item
  34. Trigger 25 items
  35. 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. In stock 3 items
  2. Out of stock 257 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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