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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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Shopping Options
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" 3 items
  6. 3.66" 1 item
  7. 3.7" 3 items
  8. 3.75" 1 item
  9. 3.86" 1 item
  10. 3.9" 10 items
  11. 4" 1 item
  12. 4.02" 2 items
  13. 4.1" 1 item
  14. 4.25" 2 items
  15. 4.3" 2 items
  16. 4.37" 1 item
  17. 4.4" 1 item
  18. 4.46" 1 item
  19. 4.5" 2 items
  20. 4.57" 1 item
  21. 4.6" 1 item
  22. 5" 2 items
Barrel Profile
  1. SDM 1 item
Caliber
  1. .45 ACP 2 items
  2. 9mm 185 items
Category
  1. Pistol parts 916 items
Color
Configuration
  1. 1st - 3rd Gen 1 item
  2. 9mm, .40, .357 1 item
  3. .45 ACP 1 item
  4. Curved 2 items
  5. Flat 1 item
  6. Gen 1-3 2 items
  7. Gen 3 22 items
  8. Gen 4 17 items
  9. GEN 4/5 1 item
  10. Gen 5 20 items
  11. Glock .40 cal Gen4 1 item
  12. Glock 9mm Gen4 1 item
  13. Glock Gen 5 2 items
  14. Large Backstrap 2 items
  15. Med Backstrap 2 items
  16. No Backstrap 2 items
  17. Right Hand 1 item
  18. Stainless Steel 2 items
  19. Standard 1 item
  20. Straight 1 item
  21. Titanium 1 item
  22. Tungsten 2 items
  23. Mid Line 1 item
  24. G17 9 items
  25. G19 15 items
  26. G26 2 items
  27. G42 1 item
  28. G43 6 items
  29. P320 9 items
  30. P365 5 items
  31. P365XL 2 items
  32. Tritium Stealth Sights 1 item
  33. Handgun 7 items
Finish
  1. Aluminum 2 items
  2. Battleworn 2 items
  3. Black 12 items
  4. Black/Black 7 items
  5. Black DLC 4 items
  6. Black/Nickel 6 items
  7. Black/TiN 7 items
  8. Blue 3 items
  9. Bronze 2 items
  10. Cerakote 1 item
  11. Chameleon 2 items
  12. Clear 1 item
  13. DLC 55 items
  14. Gold 12 items
  15. Gray 5 items
  16. Grey 5 items
  17. MDC (Gray) 1 item
  18. Melonite 1 item
  19. Nitride 13 items
  20. Polished 1 item
  21. Red 2 items
  22. Stainless Steel 1 item
  23. Titanium Nitride 1 item
  24. Anodize 5 items
  25. PVD/CVD 7 items
  26. Quench Polish Quench (QPQ) 1 item
  27. Titanium Nitride (TiN) 41 items
  28. Titanium-Carbo Nitride (TiCN) 1 item
  29. Molecular Dense Coating (MDC) 16 items
Height
  1. Absolute Co-Witness 1 item
Magazine Capacity
  1. 6rd 1 item
  2. 7rd 1 item
  3. 8rd 3 items
  4. 10rd 1 item
  5. 15rd 1 item
Manufacturer
  1. Aeroknox 1 item
  2. Agency Arms 53 items
  3. Align Tactical 12 items
  4. Angstadt Arms 1 item
  5. Apex Tactical Specialties 54 items
  6. ARC Division 5 items
  7. Armaspec 1 item
  8. Arms Republic 9 items
  9. Ascalon Arms 2 items
  10. Brügger & Thomet (B&T) 1 item
  11. Battle Arms Development 9 items
  12. Benchmade 1 item
  13. CAA 5 items
  14. CMC Triggers 2 items
  15. Danger Close Armament 15 items
  16. Dark Hour Defense 2 items
  17. Devil Dog Concepts 3 items
  18. DPM Systems Technologies 64 items
  19. Driven Arms Co. 1 item
  20. Elzetta Design LLC 1 item
  21. Emissary Development 1 item
  22. Empire 14 items
  23. Faction 1 item
  24. Faxon Firearms 24 items
  25. Fortis MFG 3 items
  26. Forward Controls Design 11 items
  27. Glock 1 item
  28. GoGun USA 3 items
  29. Grayguns 33 items
  30. Grey Ghost Precision 4 items
  31. Griffin Armament 12 items
  32. Haley Strategic 1 item
  33. Handleitgrips 9 items
  34. HB Industries 8 items
  35. HERA ARMS 1 item
  36. Icarus Precision 1 item
  37. Kagwerks 3 items
  38. Killer Innovations 63 items
  39. KNS Precision 1 item
  40. Krebs Customs 1 item
  41. L2D Combat 21 items
  42. Lantac 18 items
  43. Laugo Arms 1 item
  44. Lone Wolf Arms 13 items
  45. Magpul Industries 3 items
  46. Matrix Arms 2 items
  47. Midwest Industries 1 item
  48. Mirzon 3 items
  49. Mischief Machine 11 items
  50. Modular Evolution LLC 1 item
  51. Next Level Armament 1 item
  52. NIGHT FISION 26 items
  53. Nighthawk Custom 6 items
  54. Nomad Defense 19 items
  55. Norsso 26 items
  56. Noveske 6 items
  57. Obsidian Arms 2 items
  58. Odin Works 1 item
  59. Polymer80 3 items
  60. Radian Weapons 6 items
  61. Rainier Arms, LLC 12 items
  62. Rainier Industries 1 item
  63. Red Dirt USA 6 items
  64. Reptilia Corp 1 item
  65. SCT Manufacturing 5 items
  66. Shalotek 38 items
  67. Sharps Bros 15 items
  68. Shield Arms 1 item
  69. Sig Mechanics 2 items
  70. Sig Sauer 45 items
  71. SLR Rifleworks 3 items
  72. Spinta Precision 7 items
  73. Sprinco (Tactical Springs) 8 items
  74. Springer Precision 10 items
  75. Stoeger 1 item
  76. Strike Industries 9 items
  77. Swampfox 1 item
  78. Tactical Development 11 items
  79. Tam Tamography 1 item
  80. Taran Tactical Innovations 18 items
  81. The Gun Co. 1 item
  82. Timney Triggers 4 items
  83. Toni Systems 5 items
  84. Trijicon 2 items
  85. Trinity Nevada 7 items
  86. TruCalibre 1 item
  87. True Precision 34 items
  88. TruGlo 2 items
  89. TXC Holsters 1 item
  90. Tyrant Designs 59 items
  91. Wilson Combat 1 item
  92. Wolff Gunsprings 2 items
  93. Zaffiri Precision 2 items
  94. ZEV Technologies 1 item
Model
  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 Scorpion 1 item
  8. CZ Shadow 3 items
  9. CZ P-01 1 item
  10. CZ P-10 15 items
  11. FNH 509 5 items
  12. FNH FNS 1 item
  13. FNH FNX-45 1 item
  14. Glock 17 135 items
  15. Glock 19 181 items
  16. Glock 19X 27 items
  17. Glock 20 13 items
  18. Glock 21 13 items
  19. Glock 22 47 items
  20. Glock 23 47 items
  21. Glock 24 28 items
  22. Glock 25 14 items
  23. Glock 26 43 items
  24. Glock 27 33 items
  25. Glock 28 9 items
  26. Glock 29 11 items
  27. Glock 30 11 items
  28. Glock 31 43 items
  29. Glock 32 39 items
  30. Glock 33 32 items
  31. Glock 34 63 items
  32. Glock 35 43 items
  33. Glock 36 7 items
  34. Glock 37 27 items
  35. Glock 38 22 items
  36. Glock 39 21 items
  37. Glock 40 11 items
  38. Glock 41 11 items
  39. Glock 42 9 items
  40. Glock 43 36 items
  41. Glock 43X 29 items
  42. Glock 44 10 items
  43. Glock 45 28 items
  44. Glock 47 5 items
  45. Glock 48 35 items
  46. Glock 49 1 item
  47. H&K P2000 2 items
  48. H&K P30 3 items
  49. H&K VP9 5 items
  50. Nomad 9 4 items
  51. Sig P22X 4 items
  52. Sig P220 9 items
  53. Sig P226 10 items
  54. Sig P228 4 items
  55. Sig P229 6 items
  56. Sig P238 3 items
  57. Sig P320 154 items
  58. Sig P365 64 items
  59. Sig P365-FUSE 2 items
  60. Sig P365X 18 items
  61. Sig P365XL 44 items
  62. Sig P365 X-Macro 10 items
  63. Sig P938 3 items
  64. Sig MPX 1 item
  65. S&W M&P 6 items
  66. S&W M&P M2.0 7 items
  67. S&W M&P Shield 11 items
  68. Springfield Hellcat 12 items
  69. Springfield Hellcat Pro 2 items
  70. Springfield XD 1 item
  71. Staccato 2011 2 items
  72. Stoeger STR-9 1 item
  73. Walther PPQ 2 items
  74. Walther Q4/Q5 1 item
Mount
  1. M-LOK 1 item
  2. Picatinny 2 items
Optic Footprint
  1. Holosun 407K/507K 1 item
  2. Shield RMSc 7 items
  3. Trijicon RMR 8 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. V1 1 item
  7. V2 2 items
  8. V3 1 item
  9. Safety 2 items
  10. Manual Safety 1 item
  11. No Safety 2 items
  12. (Green) - 13 lbs 2 items
  13. (Blue) - 15 lbs 2 items
  14. (Red) - 18 lbs 2 items
  15. CZ 19 items
  16. FNH 6 items
  17. Glock 229 items
  18. Heckler & Koch 1 item
  19. Sig Sauer 82 items
  20. Smith & Wesson 15 items
  21. Springfield 2 items
  22. Walther 2 items
  23. Glock 17 1 item
  24. Right-Hand 1 item
  25. Left-Hand 3 items
  26. White/White 1 item
  27. White/Black 1 item
  28. Orange/Black 1 item
  29. White/Blank 1 item
  30. Flared 1 item
Platform
  1. 1911 6 items
  2. AR-10/LR308 1 item
  3. Beretta 2 items
  4. Canik 3 items
  5. CZ 22 items
  6. FNH 6 items
  7. Glock 372 items
  8. H&K 8 items
  9. Nomad 2 items
  10. Sig Sauer 280 items
  11. Smith & Wesson 26 items
  12. Springfield 20 items
  13. Staccato 8 items
  14. Stoeger 1 item
  15. Walther 7 items
Price
  1. $0.00 - $999.99 920 items
  2. $1,000.00 and above 10 items
Product Type
  1. Accessory 8 items
  2. Adapter Plate 1 item
  3. BackPack 1 item
  4. Backplate 3 items
  5. Barrel 3 items
  6. Basepad 11 items
  7. Bipod Mount 1 item
  8. Bolt Catch 1 item
  9. Charging Handle 5 items
  10. Compensator 54 items
  11. Connector 1 item
  12. Extended Slide Stop 4 items
  13. Failure Resistant Extractor 1 item
  14. Fire Control Unit 2 items
  15. Firing Pin 1 item
  16. Flashlight Accessory 1 item
  17. Grip Accessory 10 items
  18. Grip Module 49 items
  19. Guide Rod 35 items
  20. Handguard 1 item
  21. Handgun Barrel 143 items
  22. Handgun Grip 3 items
  23. Handgun Sights 25 items
  24. Holster 1 item
  25. Iron Sight 2 items
  26. Knife 1 item
  27. Laser 2 items
  28. Locking Block 3 items
  29. Magazine 8 items
  30. Magazine Accessory 2 items
  31. Magazine Catch 3 items
  32. Magazine Extension 7 items
  33. Magazine Release 24 items
  34. Magwell 52 items
  35. Muzzle Device Accessory 2 items
  36. Optic Plate 6 items
  37. Parts Kit 8 items
  38. Pistol Accessory 11 items
  39. Pistol Frame 40 items
  40. Pistol Grip 1 item
  41. Pistol Part 52 items
  42. Pistol Sights 18 items
  43. Rear Sight 1 item
  44. Recoil Spring 57 items
  45. Red Dot Mount 1 item
  46. Safety Selector 2 items
  47. Sight Post 3 items
  48. Sled Feet 1 item
  49. Slide 128 items
  50. Slide Parts Kit 8 items
  51. Slide Plate 7 items
  52. Spring 7 items
  53. Stabilizer Kit 4 items
  54. Take Down / Pivot Pins 1 item
  55. Thumb Rest 5 items
  56. Top Cover 1 item
  57. Trigger 89 items
  58. Upper Parts Kit 2 items
Size
  1. Small 2 items
  2. Medium 1 item
  3. Large 2 items
  4. 3 Slot 1 item
  5. 5 Slot 1 item
  6. 9 Slot 1 item
  7. Micro-Compact 1 item
  8. X-Compact 5 items
  9. Sub-Compact 1 item
  10. Compact 10 items
  11. Carry 1 item
  12. Full 6 items
Thread Pitch
  1. 1/2x28 (9mm) 95 items
  2. M13.5x1 LH 1 item
Threaded
  1. Yes 12 items
  2. No 20 items
Twist Rate
  1. 1:10 97 items
  2. 1:16 3 items
Stock Status
  1. In stock 651 items
  2. Out of stock 279 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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