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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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Barrel Length
  1. 3.1" 3 items
  2. 3.25" 1 item
  3. 3.5" 1 item
  4. 3.54" 1 item
  5. 3.6" 2 items
  6. 3.66" 1 item
  7. 3.7" 3 items
  8. 3.86" 1 item
  9. 3.9" 8 items
  10. 4.02" 2 items
  11. 4.25" 2 items
  12. 4.3" 2 items
  13. 4.37" 1 item
  14. 4.4" 1 item
  15. 4.46" 1 item
  16. 4.5" 2 items
  17. 4.57" 1 item
Barrel Profile
  1. SDM 1 item
Caliber
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  2. 9mm 141 items
Category
  1. Pistol parts 656 items
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Configuration
  1. 1st - 3rd Gen 1 item
  2. 9mm, .40, .357 1 item
  3. .45 ACP 1 item
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  17. Right Hand 1 item
  18. Stainless Steel 2 items
  19. Standard 1 item
  20. Titanium 1 item
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  22. G17 5 items
  23. G19 9 items
  24. G26 2 items
  25. G42 1 item
  26. G43 6 items
  27. P320 6 items
  28. P365 3 items
  29. P365XL 2 items
  30. Tritium Stealth Sights 1 item
  31. Handgun 5 items
Finish
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  13. Gold 9 items
  14. Gray 4 items
  15. Grey 5 items
  16. MDC (Gray) 1 item
  17. Melonite 1 item
  18. Nitride 7 items
  19. Polished 1 item
  20. Red 2 items
  21. Titanium Nitride 1 item
  22. Anodize 5 items
  23. PVD/CVD 5 items
  24. Quench Polish Quench (QPQ) 1 item
  25. Titanium Nitride (TiN) 30 items
  26. Titanium-Carbo Nitride (TiCN) 1 item
  27. Molecular Dense Coating (MDC) 14 items
Height
  1. Absolute Co-Witness 1 item
Magazine Capacity
  1. 6rd 1 item
  2. 8rd 3 items
  3. 10rd 1 item
Manufacturer
  1. Aeroknox 1 item
  2. Agency Arms 32 items
  3. Align Tactical 12 items
  4. Apex Tactical Specialties 37 items
  5. ARC Division 4 items
  6. Armaspec 1 item
  7. Arms Republic 6 items
  8. Ascalon Arms 1 item
  9. Battle Arms Development 6 items
  10. Benchmade 1 item
  11. CAA 5 items
  12. CMC Triggers 2 items
  13. Danger Close Armament 10 items
  14. Dark Hour Defense 2 items
  15. Devil Dog Concepts 3 items
  16. DPM Systems Technologies 59 items
  17. Driven Arms Co. 1 item
  18. Elzetta Design LLC 1 item
  19. Emissary Development 1 item
  20. Empire 3 items
  21. Faction 1 item
  22. Faxon Firearms 20 items
  23. Form Rifle 2 items
  24. Fortis MFG 3 items
  25. Forward Controls Design 11 items
  26. GoGun USA 2 items
  27. Grayguns 19 items
  28. Grey Ghost Precision 3 items
  29. Griffin Armament 7 items
  30. Handleitgrips 9 items
  31. HB Industries 7 items
  32. Iron City Rifle Works 1 item
  33. Kagwerks 3 items
  34. Killer Innovations 53 items
  35. KNS Precision 1 item
  36. L2D Combat 5 items
  37. Lantac 11 items
  38. Laugo Arms 1 item
  39. Lone Wolf Arms 10 items
  40. Magpul Industries 3 items
  41. Matrix Arms 2 items
  42. Mirzon 3 items
  43. Mischief Machine 2 items
  44. Modular Evolution LLC 1 item
  45. NIGHT FISION 24 items
  46. Nighthawk Custom 6 items
  47. Nomad Defense 15 items
  48. Norsso 13 items
  49. Noveske 5 items
  50. Obsidian Arms 2 items
  51. Odin Works 1 item
  52. Polymer80 3 items
  53. Radian Weapons 4 items
  54. Rainier Arms, LLC 6 items
  55. Rainier Industries 1 item
  56. Red Dirt USA 5 items
  57. Reptilia Corp 1 item
  58. SCT Manufacturing 4 items
  59. Shalotek 18 items
  60. Sharps Bros 14 items
  61. Sig Mechanics 2 items
  62. Sig Sauer 29 items
  63. Spinta Precision 3 items
  64. Sprinco (Tactical Springs) 7 items
  65. Springer Precision 5 items
  66. Strike Industries 9 items
  67. Swampfox 1 item
  68. Tactical Development 4 items
  69. Tam Tamography 1 item
  70. Taran Tactical Innovations 7 items
  71. The Gun Co. 1 item
  72. Timney Triggers 4 items
  73. Toni Systems 4 items
  74. Trijicon 2 items
  75. Trinity Nevada 4 items
  76. TruCalibre 1 item
  77. True Precision 32 items
  78. TruGlo 2 items
  79. Tyrant Designs 50 items
  80. Wolff Gunsprings 2 items
  81. Zaffiri Precision 2 items
  82. ZEV Technologies 1 item
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  1. Beretta 92X 1 item
  2. Beretta 92FS 1 item
  3. Beretta 96 1 item
  4. Beretta 98 1 item
  5. Canik TP9 1 item
  6. CZ 75 3 items
  7. CZ Shadow 2 items
  8. CZ P-01 1 item
  9. CZ P-10 10 items
  10. FNH 509 3 items
  11. FNH FNS 1 item
  12. FNH FNX-45 1 item
  13. Glock 17 99 items
  14. Glock 19 137 items
  15. Glock 19X 20 items
  16. Glock 20 8 items
  17. Glock 21 8 items
  18. Glock 22 38 items
  19. Glock 23 38 items
  20. Glock 24 20 items
  21. Glock 25 11 items
  22. Glock 26 33 items
  23. Glock 27 25 items
  24. Glock 28 6 items
  25. Glock 29 7 items
  26. Glock 30 7 items
  27. Glock 31 34 items
  28. Glock 32 31 items
  29. Glock 33 24 items
  30. Glock 34 48 items
  31. Glock 35 33 items
  32. Glock 36 5 items
  33. Glock 37 22 items
  34. Glock 38 17 items
  35. Glock 39 16 items
  36. Glock 40 7 items
  37. Glock 41 7 items
  38. Glock 42 5 items
  39. Glock 43 28 items
  40. Glock 43X 21 items
  41. Glock 44 6 items
  42. Glock 45 21 items
  43. Glock 47 4 items
  44. Glock 48 24 items
  45. H&K P30 1 item
  46. H&K VP9 4 items
  47. Nomad 9 2 items
  48. Sig P22X 2 items
  49. Sig P220 7 items
  50. Sig P226 7 items
  51. Sig P228 2 items
  52. Sig P229 4 items
  53. Sig P238 2 items
  54. Sig P320 99 items
  55. Sig P365 42 items
  56. Sig P365-FUSE 2 items
  57. Sig P365X 13 items
  58. Sig P365XL 33 items
  59. Sig P365 X-Macro 8 items
  60. Sig P938 3 items
  61. S&W M&P 5 items
  62. S&W M&P M2.0 6 items
  63. S&W M&P Shield 9 items
  64. Springfield Hellcat 11 items
  65. Springfield Hellcat Pro 2 items
  66. Springfield XD 1 item
  67. Staccato 2011 2 items
  68. Walther Q4/Q5 1 item
Optic Footprint
  1. Shield RMSc 2 items
  2. Trijicon RMR 6 items
Option
  1. FN 509 1 item
  2. Standard 1 item
  3. 6lb 1 item
  4. 6.5lb 1 item
  5. 4lb 1 item
  6. V2 1 item
  7. Safety 1 item
  8. Manual Safety 1 item
  9. No Safety 1 item
  10. (Green) - 13 lbs 2 items
  11. (Blue) - 15 lbs 2 items
  12. (Red) - 18 lbs 2 items
  13. CZ 10 items
  14. FNH 3 items
  15. Glock 174 items
  16. Sig Sauer 54 items
  17. Smith & Wesson 13 items
  18. Springfield 1 item
  19. Left-Hand 2 items
  20. White/White 1 item
  21. White/Black 1 item
  22. Orange/Black 1 item
  23. White/Blank 1 item
  24. Flared 1 item
Platform
  1. 1911 7 items
  2. AR-10/LR308 1 item
  3. Beretta 2 items
  4. Canik 3 items
  5. CZ 16 items
  6. FNH 4 items
  7. Glock 271 items
  8. H&K 5 items
  9. Nomad 2 items
  10. Sig Sauer 183 items
  11. Smith & Wesson 22 items
  12. Springfield 15 items
  13. Staccato 8 items
  14. Walther 5 items
Price
  1. $0.00 - $99.99 343 items
  2. $100.00 - $199.99 172 items
  3. $200.00 - $299.99 56 items
  4. $300.00 - $399.99 37 items
  5. $400.00 - $499.99 36 items
  6. $500.00 - $599.99 3 items
  7. $600.00 - $699.99 9 items
  8. $700.00 - $799.99 4 items
  9. $800.00 and above 3 items
Product Type
  1. Accessory 5 items
  2. Adapter Plate 1 item
  3. BackPack 1 item
  4. Backplate 3 items
  5. Barrel 3 items
  6. Basepad 7 items
  7. Bipod Mount 1 item
  8. Bolt Catch 1 item
  9. Charging Handle 3 items
  10. Compensator 45 items
  11. Extended Slide Stop 3 items
  12. Failure Resistant Extractor 1 item
  13. Fire Control Unit 2 items
  14. Firing Pin 2 items
  15. Flashlight Accessory 1 item
  16. Grip Accessory 9 items
  17. Grip Module 32 items
  18. Guide Rod 29 items
  19. Handguard 1 item
  20. Handgun Barrel 107 items
  21. Handgun Grip 5 items
  22. Handgun Sights 24 items
  23. Iron Sight 1 item
  24. Knife 1 item
  25. Laser 2 items
  26. Locking Block 2 items
  27. Magazine 5 items
  28. Magazine Accessory 1 item
  29. Magazine Catch 2 items
  30. Magazine Extension 6 items
  31. Magazine Release 19 items
  32. Magwell 37 items
  33. Optic Plate 4 items
  34. Parts Kit 6 items
  35. Pistol Accessory 10 items
  36. Pistol Frame 20 items
  37. Pistol Grip 1 item
  38. Pistol Part 31 items
  39. Pistol Sights 9 items
  40. Rear Sight 1 item
  41. Recoil Spring 52 items
  42. Safety Selector 1 item
  43. Sight Post 3 items
  44. Slide 72 items
  45. Slide Parts Kit 5 items
  46. Slide Plate 7 items
  47. Spring 6 items
  48. Stabilizer Kit 4 items
  49. Take Down / Pivot Pins 1 item
  50. Thumb Rest 5 items
  51. Trigger 63 items
Size
  1. Medium 1 item
  2. Large 1 item
  3. Micro-Compact 1 item
  4. X-Compact 2 items
  5. Sub-Compact 1 item
  6. Compact 9 items
  7. Carry 1 item
  8. Full 4 items
Thread Pitch
  1. 1/2x28 (9mm) 70 items
  2. M13.5x1 LH 1 item
Threaded
  1. Yes 10 items
  2. No 16 items
Twist Rate
  1. 1:10 74 items
  2. 1:16 3 items
Stock Status
  1. In stock 660 items Remove This Item
  2. Out of stock 3 items
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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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