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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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  1. Sharps Bros AR-15 Lower Parts Kit W/O Fire Control Group & Grip
    Sharps Bros AR-15 Lower Parts Kit W/O Fire Control Group & Grip
    $34.99
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  2. Griffin Armament M4SD Hammer Comp 5.56mm
    Griffin Armament M4SD Hammer Comp 5.56mm
    $85.00
    View Details
  3. L2D Combat Catalyst Stripped Slide For Glock 19 Gen 5 - DLC Black
    L2D Combat Catalyst Stripped Slide For Glock 19 Gen 5 - DLC Black
    $456.00
    View Details
  4. Tyrant Designs Magwell For Glock 19/23 Gen 3-4 w/ Black Screw
    Tyrant Designs Magwell For Glock 19/23 Gen 3-4 w/ Black Screw
    As low as $62.95
    +2
    View Details
  5. Mirzon Sig Sauer P320 Enhanced Grip Module Magwell
    Mirzon Sig Sauer P320 Enhanced Grip Module Magwell
    As low as $65.99
    View Details
  6. True Precision Sig P320 Compact 3.9
    True Precision Sig P320 Compact 3.9" Non-Threaded Barrel - TiN
    $199.49
    View Details
  7. Killer Innovations Trigger Shoe For Glock Gen 5
    Killer Innovations Trigger Shoe For Glock Gen 5
    As low as $115.89
    +4
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  8. Killer Innovations Velocity CZ P-10 S Trigger Shoe
    Killer Innovations Velocity CZ P-10 S Trigger Shoe
    As low as $79.99
    +4
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  9. Grayguns SIG Sauer P365XL Laser-Sculpted Grip Module
    Grayguns SIG Sauer P365XL Laser-Sculpted Grip Module
    As low as $105.00
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  10. Grayguns SIG Sauer P365XL Laser-Sculpted Grip Module w/ Manual Safety System - Black
    Grayguns SIG Sauer P365XL Laser-Sculpted Grip Module w/ Manual Safety System - Black
    $169.00
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  11. Faxon Firearms Match Series M&P Shield 9mm Barrel
    Faxon Firearms Match Series M&P Shield 9mm Barrel
    As low as $166.25
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  12. Strike Industries Magwell for STRIKE80
    Strike Industries Magwell for STRIKE80
    $17.95
    View Details
  13. Rainier Arms Exclusive Nomad 9 Enhanced Frame for Glock 19 Gen 4 - FDE
    Nomad 9 Enhanced Frame for Glock 19 Gen 4 - FDE
    $200.00
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  14. Zev Technologies Z365 Octane Slide w/ RMSc Optic Cut - DLC
    Zev Technologies Z365 Octane Slide w/ RMSc Optic Cut - DLC
    $432.18
    View Details
  15. Rainier Arms Sig Sauer P320 Fiber Optic Sight Set - LOGO
    Rainier Arms Sig Sauer P320 Fiber Optic Sight Set - LOGO
    $50.00
    View Details
  16. Faxon Firearms Match Series Sig Sauer P365XL 9mm Threaded Barrel
    Faxon Firearms Match Series Sig Sauer P365XL 9mm Threaded Barrel
    As low as $175.75
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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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Category
  1. .223 / 5.56 Magazines 5 item
  2. 10-8 Performance 1 item
  3. AR-15 .223 / 5.56 Barrels 1 item
  4. AR10 Parts 35 item
  5. AR15 Parts 108 item
  6. ARC Division 7 item
  7. Aeroknox 1 item
  8. Agency Arms 74 item
  9. Align Tactical 1 item
  10. Apex Tactical Specialties 53 item
  11. Armaspec 2 item
  12. Arms Republic 9 item
  13. Ascalon Arms 1 item
  14. BCG's & Parts 5 item
  15. Battle Arms Development 13 item
  16. Bi-Pods 2 item
  17. Blitzkrieg Components 1 item
  18. Bravo Company MFG 1 item
  19. Brügger & Thomet (B&T) 1 item
  20. Buffers 19 item
  21. Buffers, Springs & Extensons 2 item
  22. CAA 8 item
  23. CMC Triggers 5 item
  24. CMT Tactical / Cross Machine Tool 6 item
  25. Centurion Arms 1 item
  26. Charging Handles 4 item
  27. Complete Uppers 2 item
  28. DPM Systems Technologies 21 item
  29. Danger Close Armament 18 item
  30. Dark Hour Defense 6 item
  31. Dead Air Armament 1 item
  32. Devil Dog Concepts 3 item
  33. Driven Arms Co. 1 item
  34. Elite Tactical Systems (ETS) 1 item
  35. Elzetta Design 1 item
  36. Emissary Development 2 item
  37. Faction 2 item
  38. Faxon Firearms 42 item
  39. Flashlights & Mounts 2 item
  40. Forearm Systems 12 item
  41. Foregrip 2 item
  42. Fortis Manufacturing (Fortis MFG) 6 item
  43. Forward Controls Design 2 item
  44. Gas Blocks & Tubes 2 item
  45. Glock 5 item
  46. GoGun USA 2 item
  47. Grayguns 30 item
  48. Grey Ghost Precision 35 item
  49. Griffin Armament 13 item
  50. Grips 15 item
  51. HB Industries 5 item
  52. Haley Strategic 1 item
  53. Handgun Barrels 14 item
  54. Handgun Magazines 3 item
  55. Handguns 1 item
  56. Handleitgrips 21 item
  57. Heckler & Koch 1 item
  58. Hera Arms 2 item
  59. Hiperfire 1 item
  60. Holsters & Mag Carriers 6 item
  61. IWI 1 item
  62. Icarus Precision 10 item
  63. Iron City Rifle Works 1 item
  64. JK Armament 1 item
  65. JP Enterprises 1 item
  66. K Rounds LLC 2 item
  67. KNS Precision 2 item
  68. Kagwerks 3 item
  69. Killer Innovations 58 item
  70. Korth 1 item
  71. Krebs Customs 1 item
  72. Kriss 5 item
  73. L2D Combat 24 item
  74. Lancer Systems 3 item
  75. Lantac 14 item
  76. Lone Wolf Arms 3 item
  77. Magazine Accessories 7 item
  78. Magpul 9 item
  79. Mirzon 7 item
  80. Mischief Machine 4 item
  81. Mission First Tactical 1 item
  82. Modular Evolution LLC 1 item
  83. Muzzle Devices 14 item
  84. NFA 1 item
  85. Next Level Armament 3 item
  86. Night Fision 35 item
  87. Nighthawk Custom 5 item
  88. Nomad Defense 14 item
  89. Norsso 16 item
  90. Noveske 1 item
  91. Nylon 1 item
  92. ODIN Works 15 item
  93. Okay Industries 2 item
  94. Optics, Sights & Mounts 8 item
  95. Other Caliber 5 item
  96. Other Firearms 2 item
  97. Other Lower Parts 26 item
  98. Other firearm Accessories 3 item
  99. Overwatch Precision 11 item
  100. Parts & Kits 11 item
  101. Patriot Ordnance Factory (POF) 2 item
  102. Pioneer CNC 2 item
  103. Pistol Braces/Tubes 1 item
  104. Pistol parts 958 item
  105. Polymer80 20 item
  106. Primary Arms 1 item
  107. Primary Weapon Systems 3 item
  108. Project GLOCK 3 item
  109. Project Giggles 1 item
  110. Proof Research 1 item
  111. Rainier Arms 35 item
  112. Rainier Arms Barrels 1 item
  113. Receiver Parts 12 item
  114. Recover Tactical 1 item
  115. Replacement Parts - Lower 25 item
  116. Replacement Parts - Upper 4 item
  117. Reptilia Corp 1 item
  118. Rifle Handguards 2 item
  119. Rifles 2 item
  120. Rugged Suppressor 1 item
  121. SB Tactical 1 item
  122. SIG Sauer 31 item
  123. SLR Rifleworks 3 item
  124. Sharps Bros 1 item
  125. Shield Arms 1 item
  126. Smartmag 1 item
  127. Spinta Precision 4 item
  128. Sprinco (Tactical Springs) 8 item
  129. Springer Precision 17 item
  130. Springs & Extensons 2 item
  131. Stocks 2 item
  132. Stoeger 1 item
  133. Strike Industries 43 item
  134. Stripped Lower Receivers 3 item
  135. Stripped Upper Receivers 5 item
  136. Swag 3 item
  137. Swampfox 2 item
  138. TXC Holsters 4 item
  139. Tam Tamopgrahy 1 item
  140. Taran Tactical Innovations 15 item
  141. Taylor Freelance 6 item
  142. The Gun Co. 2 item
  143. Thumb Safeties 2 item
  144. Timney Triggers 5 item
  145. Toni Systems 14 item
  146. Tools 7 item
  147. Trigger Parts 5 item
  148. Triggertech 1 item
  149. Trijicon 5 item
  150. Trinity Nevada 18 item
  151. True Precision 37 item
  152. Tyrant Designs 54 item
  153. Upper/Lower Combo 3 item
  154. WMD Guns 4 item
  155. Wilson Combat 7 item
  156. Zev Technologies 49 item
Price
  1. Less than $10 21 item
  2. $10 to $25 107 item
  3. $25 to $50 128 item
  4. $50 to $100 260 item
  5. $100 to $250 344 item
  6. $250 to $500 162 item
  7. $500 to $1000 24 item
  8. Greater than $1000 23 item
Manufacturer
  1. 10-8 Performance 1 item
  2. ARC Division 7 item
  3. Aeroknox 1 item
  4. Agency Arms 74 item
  5. Align Tactical 1 item
  6. Apex Tactical Specialties 52 item
  7. Armaspec 2 item
  8. Arms Republic 9 item
  9. Ascalon Arms 1 item
  10. Battle Arms Development 13 item
  11. Blitzkrieg Components 1 item
  12. Brügger & Thomet (B&T) 1 item
  13. CAA 8 item
  14. CMC Triggers 5 item
  15. Cross Machine Tool (CMT) 5 item
  16. DPM Systems Technologies 21 item
  17. Danger Close Armament 18 item
  18. Dark Hour Defense 6 item
  19. Devil Dog Concepts 3 item
  20. Driven Arms Co. 1 item
  21. Elite Tactical Systems (ETS) 1 item
  22. Elzetta Design LLC 1 item
  23. Emissary Development 2 item
  24. Faction 2 item
  25. Faxon Firearms 41 item
  26. Fortis MFG 6 item
  27. Forward Controls Design 2 item
  28. Glock 5 item
  29. GoGun USA 3 item
  30. Grayguns 31 item
  31. Grey Ghost Precision 35 item
  32. Griffin Armament 13 item
  33. HB Industries 5 item
  34. HERA ARMS 2 item
  35. Haley Strategic 1 item
  36. Handleitgrips 21 item
  37. Heckler & Koch 1 item
  38. Hiperfire 1 item
  39. IWI 1 item
  40. Icarus Precision 10 item
  41. Iron City Rifle Works 1 item
  42. JMAC Customs 1 item
  43. JP Enterprises Inc 1 item
  44. K Rounds LLC 2 item
  45. KNS Precision 3 item
  46. Kagwerks 3 item
  47. Killer Innovations 57 item
  48. Korth 1 item
  49. Krebs Customs 1 item
  50. Kriss USA 5 item
  51. L2D Combat 24 item
  52. Lancer Systems 3 item
  53. Lantac 14 item
  54. Lone Wolf Arms 3 item
  55. Magpul Industries 9 item
  56. Mirzon 7 item
  57. Mischief Machine 4 item
  58. Mission First Tactical 1 item
  59. Modular Evolution LLC 1 item
  60. NIGHT FISION 35 item
  61. Next Level Armament 3 item
  62. Nighthawk Custom 5 item
  63. Nomad Defense 14 item
  64. Noreen Firearms 1 item
  65. Norsso 16 item
  66. Noveske 1 item
  67. Odin Works 21 item
  68. Okay Industries 2 item
  69. Overwatch Precision 11 item
  70. Patriot Ordnance Factory (POF) 2 item
  71. Pioneer CNC 2 item
  72. Polymer80 20 item
  73. Primary Arms 1 item
  74. Primary Weapon Systems 3 item
  75. Proof Research 1 item
  76. Rainier Arms, LLC 35 item
  77. Recover Tactical 1 item
  78. Reptilia Corp 1 item
  79. Rugged Suppressor 1 item
  80. SB Tactical 1 item
  81. SLR Rifleworks 3 item
  82. Seekins Precision 1 item
  83. Sharps Bros 1 item
  84. Shield Arms 1 item
  85. Sig Sauer 31 item
  86. Smartmag 1 item
  87. Spinta Precision 4 item
  88. Sprinco (Tactical Springs) 8 item
  89. Springer Precision 16 item
  90. Stoeger 1 item
  91. Strike Industries 44 item
  92. Swampfox 2 item
  93. TXC Holsters 4 item
  94. Tam Tamography 1 item
  95. Taran Tactical Innovations 16 item
  96. Taylor Freelance 6 item
  97. The Gun Co. 2 item
  98. Timney Triggers 5 item
  99. Toni Systems 14 item
  100. Triggertech 1 item
  101. Trijicon 5 item
  102. Trinity Nevada 18 item
  103. True Precision 38 item
  104. Tyrant Designs 61 item
  105. WMD Guns 4 item
  106. Wilson Combat 7 item
  107. ZEV Technologies 49 item
Caliber
  1. .22 LR 1 item
  2. .260 Rem 1 item
  3. .40 S&W 1 item
  4. .45 ACP 4 item
  5. 300 Blackout 1 item
  6. 5.56 NATO 5 item
  7. 7.62x39 2 item
  8. 7.62x51 1 item
  9. 9mm 148 item
Finish
  1. 2 item
  2. Aluminum 2 item
  3. Anodize 4 item
  4. Battleworn 2 item
  5. Black 27 item
  6. Black DLC 6 item
  7. Black Nitride 4 item
  8. Black Oxide 1 item
  9. Black/Black 7 item
  10. Black/Nickel 6 item
  11. Black/TiN 7 item
  12. Blue 5 item
  13. Bronze 8 item
  14. Cerakote 2 item
  15. Clear 1 item
  16. Cobalt Grey 2 item
  17. DLC 50 item
  18. FDE 6 item
  19. Gold 12 item
  20. Gray 7 item
  21. Grey 6 item
  22. Grey DLC 1 item
  23. Melonite 2 item
  24. Molecular Dense Coating (MDC) 5 item
  25. NeoChromatic 1 item
  26. Nitride 9 item
  27. Phosphate 1 item
  28. Polished 1 item
  29. Raw 3 item
  30. Red 8 item
  31. Stainless Steel 1 item
  32. Titan 1 item
  33. Titanium Nitride (TiN) 14 item
Option
  1. (Blue) - 15 lbs 2 item
  2. (Green) - 13 lbs 2 item
  3. (Red) - 18 lbs 2 item
  4. 4lb 1 item
  5. 6.5lb 1 item
  6. 6lb 1 item
  7. AR-10 3 item
  8. AR-15 16 item
  9. Adjustable 1 item
  10. CZ 24 item
  11. FN 509 1 item
  12. FNH 8 item
  13. Glock 428 item
  14. Glock 17 1 item
  15. Heckler & Koch 2 item
  16. KS 1 item
  17. Manual Safety 3 item
  18. Multi Cut 2 item
  19. No Safety 3 item
  20. Non-Adjustable 1 item
  21. RMR Cut 3 item
  22. Sig Sauer 131 item
  23. Smith & Wesson 22 item
  24. Springfield 10 item
  25. V1 8 item
  26. V2 10 item
  27. V3 6 item
  28. V4 6 item
  29. WA 1 item
  30. Walther 3 item
Configuration
  1. .750 DIA 3 item
  2. .875 DIA 1 item
  3. 1st - 3rd Gen 1 item
  4. 9mm, .40, .357 1 item
  5. AR-10 1 item
  6. AR-15 4 item
  7. Curved 3 item
  8. Enhanced Finger Placement (EFP) 1 item
  9. Fiber Optic - Mid Height Sights 2 item
  10. Fiber Optic - Suppressor Height Sights 2 item
  11. Flat 2 item
  12. G17 27 item
  13. G19 38 item
  14. G22 1 item
  15. G26 5 item
  16. G42 1 item
  17. G43 6 item
  18. GEN 4/5 3 item
  19. Gen 1-3 1 item
  20. Gen 3 22 item
  21. Gen 4 21 item
  22. Gen 5 11 item
  23. Glock .40 Cal Gen1-3 1 item
  24. Glock .40 cal Gen4 1 item
  25. Glock 9mm Gen 1-3 1 item
  26. Glock 9mm Gen4 1 item
  27. Glock Gen 5 1 item
  28. Large Backstrap 2 item
  29. M-LOK 2 item
  30. Med Backstrap 2 item
  31. No Backstrap 2 item
  32. P320 13 item
  33. P365 7 item
  34. P365XL 1 item
  35. Right Hand 1 item
  36. Standard 1 item
  37. Straight 2 item
  38. Tritium Stealth Sights 2 item
Stock Status
  1. In Stock 742 item
  2. Out of Stock 358 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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