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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.

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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" 4 items
  2. 3.25" 1 item
  3. 3.32" 1 item
  4. 3.5" 1 item
  5. 3.54" 1 item
  6. 3.6" 2 items
  7. 3.66" 1 item
  8. 3.7" 5 items
  9. 3.86" 1 item
  10. 3.9" 7 items
  11. 4" 5 items
  12. 4.02" 1 item
  13. 4.25" 2 items
  14. 4.3" 3 items
  15. 4.37" 1 item
  16. 4.5" 3 items
  17. 4.57" 1 item
  18. 4.6" 1 item
  19. 5" 2 items
  20. 5.1" 1 item
  21. 9" 1 item
Barrel Profile
  1. SDM 1 item
Caliber
  1. .45 ACP 2 items
  2. 10mm 1 item
  3. 9mm 164 items
Category
  1. Pistol parts 892 items
Color
Configuration
  1. 9mm, .40, .357 1 item
  2. .45 ACP 1 item
  3. Curved 3 items
  4. Flat 1 item
  5. Gen 1-3 1 item
  6. Gen 3 15 items
  7. Gen 4 10 items
  8. GEN 4/5 1 item
  9. Gen 5 24 items
  10. Glock .40 cal Gen4 1 item
  11. Glock 9mm Gen4 1 item
  12. Glock Gen 5 2 items
  13. Large Backstrap 2 items
  14. Med Backstrap 2 items
  15. No Backstrap 2 items
  16. Right Hand 1 item
  17. Stainless Steel 2 items
  18. Standard 1 item
  19. Straight 1 item
  20. Titanium 1 item
  21. Tungsten 2 items
  22. Mid Line 1 item
  23. G17 6 items
  24. G19 13 items
  25. G26 2 items
  26. G42 1 item
  27. G43 6 items
  28. P320 6 items
  29. P365 5 items
  30. P365XL 2 items
  31. Handgun 5 items
  32. Pro Curved 1 item
Finish
  1. Aluminum 2 items
  2. Black 11 items
  3. Black/Black 7 items
  4. Black DLC 2 items
  5. Black/Nickel 6 items
  6. Black/TiN 7 items
  7. Blue 3 items
  8. Chameleon 1 item
  9. DLC 47 items
  10. Gold 12 items
  11. Gray 5 items
  12. Grey 5 items
  13. MDC (Gray) 1 item
  14. Melonite 1 item
  15. Nitride 11 items
  16. Polished 1 item
  17. Red 2 items
  18. Titanium Nitride 1 item
  19. Anodize 7 items
  20. PVD/CVD 5 items
  21. Quench Polish Quench (QPQ) 1 item
  22. Titanium Nitride (TiN) 32 items
  23. Titanium-Carbo Nitride (TiCN) 1 item
  24. Molecular Dense Coating (MDC) 15 items
Magazine Capacity
  1. 6rd 1 item
  2. 8rd 3 items
  3. 10rd 1 item
  4. 17rd 6 items
  5. 19rd 1 item
  6. 21rd 1 item
Manufacturer
  1. Agency Arms 47 items
  2. Align Tactical 14 items
  3. Angstadt Arms 1 item
  4. Apex Tactical Specialties 47 items
  5. ARC Division 4 items
  6. Arms Republic 5 items
  7. Ascalon Arms 2 items
  8. Atlas Gunworks 2 items
  9. Battle Arms Development 6 items
  10. Benchmade 1 item
  11. CAA 2 items
  12. Check-Mate 1 item
  13. CMC Triggers 2 items
  14. Danger Close Armament 14 items
  15. Dark Hour Defense 1 item
  16. DPM Systems Technologies 78 items
  17. Driven Arms Co. 1 item
  18. Edgar Sherman Design 1 item
  19. Elite Tactical Systems (ETS) 1 item
  20. Elzetta Design LLC 1 item
  21. Empire 15 items
  22. Faxon Firearms 24 items
  23. Flux Defense 1 item
  24. Form Rifle 2 items
  25. Fortis MFG 3 items
  26. Forward Controls Design 11 items
  27. GoGun USA 3 items
  28. Grayguns 32 items
  29. Griffin Armament 12 items
  30. Haley Strategic 1 item
  31. Handleitgrips 1 item
  32. HB Industries 8 items
  33. Heckler & Koch 1 item
  34. Icarus Precision 14 items
  35. JL Billet 1 item
  36. Killer Innovations 60 items
  37. KNS Precision 1 item
  38. Krebs Customs 1 item
  39. KynSHOT 1 item
  40. L2D Combat 4 items
  41. Lantac 4 items
  42. Laugo Arms 1 item
  43. Lone Wolf Arms 13 items
  44. Magpul Industries 3 items
  45. Matrix Arms 2 items
  46. Midwest Industries 1 item
  47. Mirzon 3 items
  48. Mischief Machine 19 items
  49. Next Level Armament 1 item
  50. NIGHT FISION 37 items
  51. Nighthawk Custom 6 items
  52. Nomad Defense 24 items
  53. Norsso 24 items
  54. Noveske 7 items
  55. Obsidian Arms 2 items
  56. Polymer80 3 items
  57. PRIMATIA 6 items
  58. Radian Weapons 16 items
  59. Rainier Arms, LLC 9 items
  60. Rainier Industries 1 item
  61. Ramm Tactical 1 item
  62. Red Dirt USA 6 items
  63. Reptilia Corp 1 item
  64. SCT Manufacturing 5 items
  65. Shadow Systems 2 items
  66. Shalotek 41 items
  67. Sharps Bros 22 items
  68. Shield Arms 1 item
  69. Sig Mechanics 2 items
  70. Sig Sauer 27 items
  71. Silencerco 2 items
  72. Sprinco (Tactical Springs) 8 items
  73. Springer Precision 10 items
  74. Staccato 1 item
  75. Streamlight 2 items
  76. Strike Industries 2 items
  77. Tactical Development 12 items
  78. Taran Tactical Innovations 18 items
  79. Timney Triggers 4 items
  80. Toni Systems 4 items
  81. Triggertech 3 items
  82. Trijicon 2 items
  83. Trinity Nevada 2 items
  84. True Precision 34 items
  85. TruGlo 2 items
  86. TXC Holsters 1 item
  87. Tyrant Designs 62 items
  88. Vytal Manufacturing 6 items
  89. Wolff Gunsprings 1 item
Model
  1. 2K11 3 items
  2. Beretta 80x Cheetah 1 item
  3. Beretta 84 FS Cheetah 1 item
  4. Beretta 85 FS Cheetah 1 item
  5. Beretta 92X 1 item
  6. Beretta 92FS 1 item
  7. Beretta 96 1 item
  8. Beretta 98 1 item
  9. Bul Armory 2 items
  10. Canik MC9 LS 1 item
  11. Canik MC9 Prime 1 item
  12. Canik TP9 1 item
  13. Canik TP9DA 1 item
  14. Canik TP9SF METE-S 1 item
  15. Canik TTI Combat 1 item
  16. CZ 75 6 items
  17. CZ Scorpion 1 item
  18. CZ Shadow 3 items
  19. CZ Shadow 2 5 items
  20. CZ P-01 2 items
  21. CZ P-10 13 items
  22. Dan Wessen DWX 1 item
  23. FNH 509 5 items
  24. FNH FNS 1 item
  25. FNH FNX-45 1 item
  26. Glock 17 118 items
  27. Glock 19 159 items
  28. Glock 19X 22 items
  29. Glock 20 13 items
  30. Glock 21 13 items
  31. Glock 22 43 items
  32. Glock 23 43 items
  33. Glock 24 26 items
  34. Glock 25 12 items
  35. Glock 26 43 items
  36. Glock 26X 2 items
  37. Glock 27 30 items
  38. Glock 28 7 items
  39. Glock 29 9 items
  40. Glock 30 9 items
  41. Glock 31 37 items
  42. Glock 32 34 items
  43. Glock 33 30 items
  44. Glock 34 60 items
  45. Glock 35 44 items
  46. Glock 36 7 items
  47. Glock 37 24 items
  48. Glock 38 19 items
  49. Glock 39 18 items
  50. Glock 40 12 items
  51. Glock 41 12 items
  52. Glock 42 9 items
  53. Glock 43 37 items
  54. Glock 43X 31 items
  55. Glock 44 8 items
  56. Glock 45 26 items
  57. Glock 47 8 items
  58. Glock 48 36 items
  59. Glock 49 4 items
  60. H&K CC9 1 item
  61. H&K P2000 2 items
  62. H&K P30 3 items
  63. H&K VP9 4 items
  64. M&P Carry Comp 2 items
  65. Nomad 9 4 items
  66. Ruger RXM 1 item
  67. RXM 3 items
  68. Shadow Systems MR920 1 item
  69. Sig P22X 4 items
  70. Sig P220 9 items
  71. Sig P226 10 items
  72. Sig P228 4 items
  73. Sig P229 6 items
  74. Sig P238 3 items
  75. Sig P320 123 items
  76. Sig P365 64 items
  77. Sig P365-FUSE 13 items
  78. Sig P365X 20 items
  79. Sig P365XL 50 items
  80. Sig P365 X-Macro 26 items
  81. Sig P938 3 items
  82. Sig MPX 1 item
  83. S&W M&P 6 items
  84. S&W M&P M2.0 7 items
  85. S&W M&P Shield 11 items
  86. Springfield Echelon 7 items
  87. Springfield Hellcat 13 items
  88. Springfield Hellcat Pro 3 items
  89. Springfield Prodigy 4 items
  90. Springfield XD 1 item
  91. Springfield XD-M 1 item
  92. Springfield XDS 1 item
  93. Staccato 2011 5 items
  94. Staccato C2 3 items
  95. Staccato C 1 item
  96. Staccato CS 1 item
  97. Staccato P 4 items
  98. Staccato HD P4 1 item
  99. Staccato HD P4.5 1 item
  100. Staccato XC 3 items
  101. Taurus GX4 2 items
  102. Walther PPQ 1 item
  103. Walther PDP 2 items
  104. Walther Q4/Q5 1 item
Mount
  1. Picatinny 2 items
Optic Footprint
  1. Aimpoint Acro 1 item
  2. Holosun 407K/507K 4 items
  3. Shield RMSc 9 items
  4. Trijicon RMR 8 items
Option
  1. FN 509 1 item
  2. Standard 1 item
  3. 6lb 1 item
  4. 6.5lb 1 item
  5. V2 1 item
  6. Safety 2 items
  7. Manual Safety 1 item
  8. No Safety 2 items
  9. (Green) - 13 lbs 2 items
  10. (Blue) - 15 lbs 2 items
  11. (Red) - 18 lbs 2 items
  12. CZ 17 items
  13. FNH 6 items
  14. Glock 178 items
  15. Sig Sauer 69 items
  16. Smith & Wesson 14 items
  17. Springfield 2 items
  18. Walther 1 item
  19. Right-Hand 1 item
  20. Left-Hand 3 items
  21. White/White 1 item
  22. White/Black 1 item
  23. Orange/Black 1 item
  24. White/Blank 1 item
  25. Flared 1 item
  26. Blank + Blank 6 items
  27. Yellow Tritium + Blank Rear 6 items
Platform
  1. 1911 6 items
  2. AR-10/LR308 1 item
  3. Beretta 3 items
  4. Bul Armory 2 items
  5. Canik 3 items
  6. CZ 22 items
  7. Dan Wessen 1 item
  8. FNH 6 items
  9. Glock 313 items
  10. H&K 7 items
  11. Nomad 2 items
  12. Ruger 3 items
  13. Shadow Systems 1 item
  14. Sig Sauer 264 items
  15. Smith & Wesson 25 items
  16. Springfield 28 items
  17. Staccato 12 items
  18. Walther 6 items
Price
  1. $0.00 - $999.99 890 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. Builders Kit 5 items
  8. Charging Handle 5 items
  9. Chassis 1 item
  10. Compensator 53 items
  11. Connector 1 item
  12. Extended Slide Stop 4 items
  13. Failure Resistant Extractor 1 item
  14. Fire Control Unit 2 items
  15. Flashlight 2 items
  16. Flashlight Accessory 1 item
  17. Grip Accessory 2 items
  18. Grip Module 72 items
  19. Guide Rod 32 items
  20. Handguard 1 item
  21. Handgun Barrel 129 items
  22. Handgun Grip 11 items
  23. Handgun Sights 35 items
  24. Holster 1 item
  25. Iron Sight 2 items
  26. Knife 1 item
  27. Laser 1 item
  28. Locking Block 3 items
  29. Magazine 10 items
  30. Magazine Accessory 1 item
  31. Magazine Catch 3 items
  32. Magazine Extension 6 items
  33. Magazine Release 24 items
  34. Magwell 56 items
  35. Muzzle Device Accessory 2 items
  36. Optic Plate 7 items
  37. Parts Kit 6 items
  38. Pistol Accessory 11 items
  39. Pistol Frame 25 items
  40. Pistol Grip 1 item
  41. Pistol Part 51 items
  42. Pistol Sights 12 items
  43. Rear Sight 1 item
  44. Recoil Spring 74 items
  45. Red Dot Mount 1 item
  46. Safety Selector 3 items
  47. Sight Post 2 items
  48. Sled Feet 1 item
  49. Slide 99 items
  50. Slide Parts Kit 5 items
  51. Slide Plate 6 items
  52. Spring 7 items
  53. Stabilizer Kit 1 item
  54. Take Down / Pivot Pins 1 item
  55. Thumb Rest 6 items
  56. Top Cover 1 item
  57. Trigger 84 items
  58. Trigger Guard 1 item
Size
  1. Large 1 item
  2. Micro-Compact 1 item
  3. X-Compact 3 items
  4. Sub-Compact 1 item
  5. Compact 7 items
  6. Carry 1 item
  7. Full 5 items
Thread Pitch
  1. 1/2x28 (9mm) 84 items
  2. M13.5x1 LH 1 item
Threaded
  1. Yes 11 items
  2. No 20 items
Twist Rate
  1. 1:10 80 items
  2. 1:16 3 items
Stock Status
  1. In stock 559 items
  2. Out of stock 341 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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