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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.

Parts

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  3. Tyrant Designs Slide Cover Plate For Glock 43
    Tyrant Designs Slide Cover Plate For Glock 43
    $17.95
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  4. True Precision Sig Sauer P365 X-Fluted Match Grade Barrel
    True Precision Sig Sauer P365 X-Fluted Match Grade Barrel
    $161.49 - $180.49
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  5. True Precision Sig Sauer P365 X-Fluted Match Grade Barrel Threaded 1/2X28
    True Precision Sig Sauer P365 X-Fluted Match Grade Barrel Threaded 1/2X28
    $170.99 - $189.99
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  6. Battle Arms Development Mag Enhancement Kit For Glock 17
    Battle Arms Development Mag Enhancement Kit For Glock 17
    $124.92
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  10. Killer Innovations Velocity Compensator For Glock - Gen 5
    Killer Innovations Velocity Compensator For Glock - Gen 5
    $104.49
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  13. Tyrant Designs Extended Magazine Release For Glock Gen 3
    Tyrant Designs Extended Magazine Release For Glock Gen 3
    $25.15 - $26.55
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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" 2 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" 4 items
  8. 3.86" 1 item
  9. 3.9" 9 items
  10. 4" 1 item
  11. 4.02" 2 items
  12. 4.37" 1 item
  13. 4.4" 1 item
  14. 4.46" 1 item
  15. 4.5" 2 items
  16. 4.57" 2 items
  17. 4.6" 2 items
  18. 5" 2 items
Barrel Profile
  1. Non-fluted 1 item
  2. SDM 1 item
Caliber
  1. .45 ACP 2 items
  2. 9mm 143 items
Category
  1. Pistol parts 866 items
Color
Configuration
  1. 1st - 3rd Gen 1 item
  2. 9mm, .40, .357 1 item
  3. .45 ACP 1 item
  4. Curved 1 item
  5. Flat 1 item
  6. Gen 1-3 2 items
  7. Gen 3 21 items
  8. Gen 4 16 items
  9. GEN 4/5 1 item
  10. Gen 5 15 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 13 items
  25. G19 24 items
  26. G26 2 items
  27. G42 1 item
  28. G43 9 items
  29. P320 12 items
  30. P365 6 items
  31. P365XL 3 items
  32. Fiber Optic - Mid Height Sights 2 items
  33. Fiber Optic - Suppressor Height Sights 2 items
  34. Tritium Stealth Sights 2 items
  35. Handgun 7 items
Finish
  1. Aluminum 2 items
  2. Battleworn 2 items
  3. Black 14 items
  4. Black/Black 7 items
  5. Black DLC 7 items
  6. Black Nitride 2 items
  7. Black/Nickel 6 items
  8. Black/TiN 7 items
  9. Blue 3 items
  10. Bronze 2 items
  11. Cerakote 1 item
  12. Chameleon 1 item
  13. Clear 1 item
  14. DLC 62 items
  15. Gold 12 items
  16. Gray 5 items
  17. Grey 5 items
  18. MDC (Gray) 1 item
  19. Melonite 2 items
  20. NeoChromatic 1 item
  21. Nitride 18 items
  22. Polished 1 item
  23. Red 2 items
  24. Stainless Steel 1 item
  25. Titanium Nitride 1 item
  26. Anodize 5 items
  27. PVD/CVD 7 items
  28. Quench Polish Quench (QPQ) 1 item
  29. Titanium Nitride (TiN) 52 items
  30. Molecular Dense Coating (MDC) 18 items
Gas Length
  1. Pistol 1 item
Height
  1. Absolute Co-Witness 1 item
Is Firearms?
  1. No 880 items
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 7 items
  4. Angstadt Arms 1 item
  5. Apex Tactical Specialties 55 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 3 items
  15. Danger Close Armament 15 items
  16. Dark Hour Defense 2 items
  17. Devil Dog Concepts 3 items
  18. DPM Systems Technologies 56 items
  19. Driven Arms Co. 1 item
  20. Elzetta Design LLC 1 item
  21. Emissary Development 1 item
  22. Empire 11 items
  23. Faction 1 item
  24. Faxon Firearms 24 items
  25. Fortis MFG 3 items
  26. Forward Controls Design 9 items
  27. Glock 1 item
  28. GoGun USA 3 items
  29. Grayguns 31 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. Kagwerks 3 items
  37. Killer Innovations 66 items
  38. KNS Precision 1 item
  39. Krebs Customs 1 item
  40. L2D Combat 21 items
  41. Lantac 19 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 11 items
  49. Modular Evolution LLC 1 item
  50. Next Level Armament 1 item
  51. NIGHT FISION 25 items
  52. Nighthawk Custom 6 items
  53. Nomad Defense 18 items
  54. Norsso 23 items
  55. Obsidian Arms 2 items
  56. Odin Works 1 item
  57. Polymer80 3 items
  58. Radian Weapons 4 items
  59. Rainier Arms, LLC 12 items
  60. Rainier Industries 1 item
  61. Red Dirt USA 5 items
  62. Reptilia Corp 1 item
  63. S3F Solutions 5 items
  64. SCT Manufacturing 5 items
  65. Shalotek 25 items
  66. Sharps Bros 12 items
  67. Shield Arms 1 item
  68. Sig Mechanics 1 item
  69. Sig Sauer 45 items
  70. SLR Rifleworks 3 items
  71. Spinta Precision 7 items
  72. Sprinco (Tactical Springs) 8 items
  73. Springer Precision 10 items
  74. Stoeger 1 item
  75. Strike Industries 6 items
  76. Swampfox 2 items
  77. Tactical Development 11 items
  78. Tam Tamography 1 item
  79. Taran Tactical Innovations 18 items
  80. Taylor Freelance 1 item
  81. The Gun Co. 1 item
  82. Timney Triggers 2 items
  83. Toni Systems 5 items
  84. Trijicon 2 items
  85. Trinity Nevada 8 items
  86. TruCalibre 1 item
  87. True Precision 28 items
  88. TruGlo 2 items
  89. TXC Holsters 1 item
  90. Tyrant Designs 58 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 16 items
  11. FNH 509 6 items
  12. FNH FNS 1 item
  13. FNH FNX-45 1 item
  14. Glock 17 131 items
  15. Glock 19 172 items
  16. Glock 19X 25 items
  17. Glock 20 12 items
  18. Glock 21 12 items
  19. Glock 22 45 items
  20. Glock 23 46 items
  21. Glock 24 27 items
  22. Glock 25 13 items
  23. Glock 26 44 items
  24. Glock 27 32 items
  25. Glock 28 8 items
  26. Glock 29 10 items
  27. Glock 30 10 items
  28. Glock 31 41 items
  29. Glock 32 38 items
  30. Glock 33 31 items
  31. Glock 34 61 items
  32. Glock 35 42 items
  33. Glock 36 7 items
  34. Glock 37 26 items
  35. Glock 38 21 items
  36. Glock 39 20 items
  37. Glock 40 10 items
  38. Glock 41 10 items
  39. Glock 42 9 items
  40. Glock 43 37 items
  41. Glock 43X 29 items
  42. Glock 44 10 items
  43. Glock 45 25 items
  44. Glock 47 4 items
  45. Glock 48 36 items
  46. H&K P2000 2 items
  47. H&K P30 3 items
  48. H&K VP9 5 items
  49. Nomad 9 4 items
  50. Sig P22X 4 items
  51. Sig P220 9 items
  52. Sig P226 10 items
  53. Sig P228 4 items
  54. Sig P229 6 items
  55. Sig P238 3 items
  56. Sig P320 151 items
  57. Sig P365 53 items
  58. Sig P365X 12 items
  59. Sig P365XL 35 items
  60. Sig P365 X-Macro 7 items
  61. Sig P938 3 items
  62. Sig MPX 1 item
  63. S&W M&P 6 items
  64. S&W M&P M2.0 7 items
  65. S&W M&P Shield 11 items
  66. Springfield Hellcat 12 items
  67. Springfield XD 1 item
  68. Staccato 2011 2 items
  69. Stoeger STR-9 1 item
  70. Walther PPQ 2 items
  71. 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 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. 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. Sig Sauer P Series 1 item
  13. (Green) - 13 lbs 2 items
  14. (Blue) - 15 lbs 2 items
  15. (Red) - 18 lbs 2 items
  16. CZ 21 items
  17. FNH 7 items
  18. Glock 257 items
  19. Heckler & Koch 1 item
  20. Sig Sauer 95 items
  21. Smith & Wesson 16 items
  22. Springfield 4 items
  23. Walther 2 items
  24. Glock 17 1 item
  25. Right-Hand 1 item
  26. Left-Hand 1 item
  27. White/White 1 item
  28. White/Black 1 item
  29. Orange/Black 1 item
  30. White/Blank 1 item
  31. Flared 1 item
Platform
  1. 1911 6 items
  2. AR-10 1 item
  3. Beretta 2 items
  4. Canik 2 items
  5. CZ-USA 23 items
  6. FNH 7 items
  7. Glock 357 items
  8. H&K 8 items
  9. Nomad 2 items
  10. Sig Sauer 251 items
  11. Smith & Wesson 24 items
  12. Springfield 17 items
  13. Staccato 6 items
  14. Stoeger 1 item
  15. Walther 7 items
Price
  1. $0.00 - $999.99 874 items
  2. $1,000.00 and above 6 items
Product Type
  1. Accessory 8 items
  2. Adapter Plate 1 item
  3. BackPack 1 item
  4. Backplate 2 items
  5. Barrel 146 items
  6. Basepad 13 items
  7. Bipod Mount 1 item
  8. Bolt Catch 1 item
  9. Charging Handle 5 items
  10. Compensator 51 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 35 items
  19. Guide Rod 33 items
  20. Handgun Grip 3 items
  21. Handgun Sights 24 items
  22. Holster 1 item
  23. Iron Sight 2 items
  24. Knife 1 item
  25. Laser 2 items
  26. Locking Block 3 items
  27. Magazine 8 items
  28. Magazine Accessory 2 items
  29. Magazine Catch 3 items
  30. Magazine Extension 7 items
  31. Magazine Release 21 items
  32. Magwell 51 items
  33. Muzzle Device Accessory 2 items
  34. Optic Plate 6 items
  35. Parts Kit 9 items
  36. Pistol Accessory 11 items
  37. Pistol Frame 37 items
  38. Pistol Grip 1 item
  39. Pistol Part 51 items
  40. Pistol Sights 18 items
  41. Rear Sight 1 item
  42. Recoil Spring 49 items
  43. Safety Selector 2 items
  44. Sight Post 2 items
  45. Sled Feet 1 item
  46. Slide 122 items
  47. Slide Parts Kit 8 items
  48. Slide Plate 7 items
  49. Spring 7 items
  50. Stabilizer Kit 4 items
  51. Take Down / Pivot Pins 1 item
  52. Thumb Rest 1 item
  53. Top Cover 1 item
  54. Trigger 80 items
  55. Trigger / Hammer Pins 1 item
  56. 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 6 items
  9. Sub-Compact 1 item
  10. Compact 12 items
  11. Carry 1 item
  12. Full 6 items
Thread Pitch
  1. 1/2x28 58 items
  2. M13.5x1 LH 1 item
Threaded
  1. Yes 24 items
  2. No 37 items
Twist Rate
  1. 1:9 1 item
  2. 1:10 57 items
  3. 1:16 2 items
Stock Status
  1. In stock 649 items
  2. Out of stock 231 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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