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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. Dark Hour Defense GSOD For Glock 19
    Dark Hour Defense GSOD For Glock 19
    $80.51
    View Details
  2. Dark Hour Defense GSOD For Glock 17
    Dark Hour Defense GSOD For Glock 17
    $91.18
    View Details
  3. Night Fision Tritium Sight Set For Glock - Square Rear
    Night Fision Tritium Sight Set For Glock - Square Rear
    As low as $97.20
    View Details
  4. Killer Innovations Universal Velocity Magwell For Glock 17/22/31 -
    Killer Innovations Universal Velocity Magwell For Glock 17/22/31 -
    As low as $94.49
    +2 Show More Show Less
    View Details
  5. Killer Innovations Universal Velocity Magwell For Glock 19/23/32
    Killer Innovations Universal Velocity Magwell For Glock 19/23/32
    As low as $94.49
    +2 Show More Show Less
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  6. Killer Innovations Velocity Thread Protector 1/2×28
    Killer Innovations Velocity Thread Protector 1/2×28
    $14.99
    View Details
  7. Magpul Enhanced Magwell For Glock 19 Gen 4
    Magpul Enhanced Magwell For Glock 19 Gen 4
    $23.70
    View Details
  8. Faxon Firearms Sig Sauer P320 Compact Flamed Barrel - Nitride
    Faxon Firearms Sig Sauer P320 Compact Flamed Barrel - Nitride
    $185.25
    View Details
  9. Apex Tactical Specialties M&P M2.0 Shield Action Enhancement Trigger & Duty/Carry Kit - Black
    Apex Tactical Specialties M&P M2.0 Shield Action Enhancement Trigger & Duty/Carry Kit - Black
    $151.95
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  10. Magpul MIAD Gen 1.1 Grip Kit AR15 - Black
    Magpul MIAD Gen 1.1 Grip Kit AR15 - Black
    $34.15
    View Details
  11. Agency Arms Drop In Trigger For Glock
    Agency Arms Drop In Trigger For Glock
    As low as $135.00
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  12. Apex Tactical Specialties M&P Shield Action Enhancement Trigger
    Apex Tactical Specialties M&P Shield Action Enhancement Trigger
    $73.10
    View Details
  13. Trijicon M&P HD Night Sight Set-Yellow Front Outline
    Trijicon M&P HD Night Sight Set-Yellow Front Outline
    $156.75
    View Details
  14. Killer Innovations Non-Threaded Velocity Barrel For Glock 26
    Killer Innovations Non-Threaded Velocity Barrel For Glock 26
    As low as $189.99
    View Details
  15. Killer Innovations Threaded Velocity Barrel For Glock 26
    Killer Innovations Threaded Velocity Barrel For Glock 26
    As low as $209.99
    View Details
  16. Sig Sauer GRIP MODULE Assembly FULL SIZE 320 X-Series w/ Funnel & Weight - Grey Medium
    Sig Sauer GRIP MODULE Assembly FULL SIZE 320 X-Series w/ Funnel & Weight - Grey Medium
    $279.99
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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 7 item
  2. 10-8 Performance 10 item
  3. 7.62 x 51 / .308 Magazines 1 item
  4. ANR Design 1 item
  5. AR-15 .223 / 5.56 Barrels 1 item
  6. AR10 Parts 45 item
  7. AR15 Parts 201 item
  8. ARC Division 7 item
  9. Aeroknox 1 item
  10. Agency Arms 75 item
  11. Align Tactical 1 item
  12. Apex Tactical Specialties 50 item
  13. Apparel 2 item
  14. Armaspec 2 item
  15. Arms Republic 7 item
  16. Arsenal Firearms 1 item
  17. Ascalon Arms 1 item
  18. BCG's & Parts 7 item
  19. Battle Arms Development 10 item
  20. Bi-Pods 3 item
  21. Blitzkrieg Components 1 item
  22. Bravo Company MFG 1 item
  23. Brügger & Thomet (B&T) 1 item
  24. Buffers 53 item
  25. Buffers, Springs & Extensons 3 item
  26. CAA 17 item
  27. CMC Triggers 11 item
  28. CMT Tactical / Cross Machine Tool 7 item
  29. CR Precision 2 item
  30. Centurion Arms 1 item
  31. Charging Handles 9 item
  32. Complete Uppers 1 item
  33. DCA Barrels 2 item
  34. DK Custom Coatings 4 item
  35. DPM Systems Technologies 18 item
  36. Danger Close Armament 35 item
  37. Dark Hour Defense 6 item
  38. Dead Air Armament 1 item
  39. Devil Dog Concepts 3 item
  40. Elite Tactical Systems (ETS) 1 item
  41. Elzetta Design 2 item
  42. Faction 3 item
  43. Faxon Firearms 39 item
  44. Flashlights & Mounts 4 item
  45. Forearm Systems 19 item
  46. Foregrip 2 item
  47. Fortis Manufacturing (Fortis MFG) 7 item
  48. Forward Controls Design 2 item
  49. Gas Blocks & Tubes 4 item
  50. Gill Firearms 1 item
  51. Glock 3 item
  52. GoGun USA 4 item
  53. Grayguns 29 item
  54. Grey Ghost Precision 39 item
  55. Griffin Armament 14 item
  56. Grips 18 item
  57. Gun Pro 4 item
  58. HB Industries 1 item
  59. Handgun Barrels 24 item
  60. Handgun Magazines 5 item
  61. Handguns 1 item
  62. Heckler & Koch 2 item
  63. Hera Arms 3 item
  64. Hiperfire 1 item
  65. Holsters & Mag Carriers 11 item
  66. IWI 2 item
  67. Icarus Precision 10 item
  68. Iron City Rifle Works 1 item
  69. JP Enterprises 1 item
  70. K Rounds LLC 4 item
  71. KNS Precision 2 item
  72. Kagwerks 2 item
  73. Killer Innovations 50 item
  74. Korth 1 item
  75. Kriss 5 item
  76. L2D Combat 28 item
  77. LWRC International 1 item
  78. Lancer Systems 4 item
  79. Lantac 14 item
  80. Legion Precision 2 item
  81. Lone Wolf Arms 1 item
  82. MBX Extreme 2 item
  83. Magazine Accessories 5 item
  84. Magpul 9 item
  85. Mirzon 7 item
  86. Mission First Tactical 1 item
  87. Modular Evolution LLC 1 item
  88. Muzzle Devices 18 item
  89. NFA 4 item
  90. Next Level Armament 9 item
  91. Night Fision 33 item
  92. Nighthawk Custom 6 item
  93. Nomad Defense 12 item
  94. Norsso 21 item
  95. Noveske 8 item
  96. Nylon 1 item
  97. ODIN Works 16 item
  98. Okay Industries 4 item
  99. Optics 10 item
  100. Optics, Sights & Mounts 19 item
  101. Other Caliber 8 item
  102. Other Firearms 4 item
  103. Other Lower Parts 63 item
  104. Other firearm Accessories 3 item
  105. Otis Technologies 1 item
  106. Overwatch Precision 11 item
  107. Parts & Kits 11 item
  108. Patriot Ordnance Factory (POF) 6 item
  109. Pioneer CNC 2 item
  110. Pistol Braces/Tubes 1 item
  111. Pistol parts 983 item
  112. Pistols 2 item
  113. Polymer 80 20 item
  114. Polymer80 8 item
  115. Primary Arms 4 item
  116. Primary Weapon Systems 4 item
  117. Project GLOCK 3 item
  118. Project Giggles 1 item
  119. Proof Research 1 item
  120. Radian Weapons 1 item
  121. Rainier Arms 62 item
  122. Rainier Arms Barrels 1 item
  123. Receiver Parts 7 item
  124. Recover Tactical 9 item
  125. Replacement Parts - Lower 62 item
  126. Replacement Parts - Upper 6 item
  127. Reptilia Corp 1 item
  128. Rifle Handguards 2 item
  129. Rifles 7 item
  130. Rugged Suppressor 1 item
  131. SB Tactical 1 item
  132. SIG Sauer 27 item
  133. SLR Rifleworks 3 item
  134. Scalarworks 3 item
  135. Sharps Bros 1 item
  136. Shield Arms 1 item
  137. Slings & Mounts 3 item
  138. Smartmag 1 item
  139. Smith & Wesson 1 item
  140. Sprinco (Tactical Springs) 9 item
  141. Springer Precision 16 item
  142. Springs & Extensons 2 item
  143. Stocks 5 item
  144. Stoeger 1 item
  145. Strike Industries 46 item
  146. Stripped Lower Receivers 6 item
  147. Stripped Upper Receivers 8 item
  148. Swag 9 item
  149. TXC Holsters 5 item
  150. Tactical Edge Arms 1 item
  151. Tactical Link 2 item
  152. Taylor Freelance 6 item
  153. Thumb Safeties 2 item
  154. Timney Triggers 4 item
  155. Toni Systems 12 item
  156. Tools 14 item
  157. Torkmag 1 item
  158. Trigger Parts 7 item
  159. Triggertech 1 item
  160. Trijicon 15 item
  161. Trinity Nevada 8 item
  162. True Precision 38 item
  163. Tyrant Designs 45 item
  164. Umbrella Corporation 2 item
  165. Upper/Lower Combo 5 item
  166. Venom Defense 1 item
  167. Vortex Optics 3 item
  168. WMD Guns 3 item
  169. Zev Technologies 85 item
Price
  1. Less than $10 34 item
  2. $10 to $25 100 item
  3. $25 to $50 144 item
  4. $50 to $100 265 item
  5. $100 to $250 407 item
  6. $250 to $500 185 item
  7. $500 to $1000 32 item
  8. Greater than $1000 31 item
Manufacturer
  1. 10-8 Performance 10 item
  2. ANR Design 1 item
  3. ARC Division 7 item
  4. Aeroknox 1 item
  5. Agency Arms 75 item
  6. Align Tactical 1 item
  7. Apex Tactical Specialties 49 item
  8. Armaspec 2 item
  9. Arms Republic 7 item
  10. Arsenal Firearms 1 item
  11. Ascalon Arms 1 item
  12. Battle Arms Development 10 item
  13. Blitzkrieg Components 1 item
  14. Brügger & Thomet (B&T) 1 item
  15. CAA 17 item
  16. CMC Triggers 11 item
  17. CR Precision 2 item
  18. Cross Machine Tool (CMT) 6 item
  19. DK Custom Coatings 4 item
  20. DPM Systems Technologies 18 item
  21. Danger Close Armament 35 item
  22. Dark Hour Defense 6 item
  23. Devil Dog Concepts 3 item
  24. Elite Tactical Systems (ETS) 1 item
  25. Elzetta Design LLC 2 item
  26. Faction 3 item
  27. Faxon Firearms 39 item
  28. Fortis MFG 7 item
  29. Forward Controls Design 2 item
  30. Gill Firearms 1 item
  31. Glock 3 item
  32. GoGun USA 4 item
  33. Grayguns 30 item
  34. Grey Ghost Precision 39 item
  35. Griffin Armament 14 item
  36. Gun Pro 5 item
  37. HERA ARMS 3 item
  38. Heckler & Koch 2 item
  39. Hiperfire 1 item
  40. IWI 2 item
  41. Icarus Precision 10 item
  42. Iron City Rifle Works 1 item
  43. JP Enterprises Inc 1 item
  44. K Rounds LLC 5 item
  45. KNS Precision 3 item
  46. Kagwerks 2 item
  47. Killer Innovations 49 item
  48. Kinetic Development Group 1 item
  49. Korth 1 item
  50. Kriss USA 5 item
  51. L2D Combat 28 item
  52. LWRC International 1 item
  53. Lancer Systems 4 item
  54. Lantac 14 item
  55. Legion Precision 2 item
  56. Lone Wolf Arms 1 item
  57. MBX Extreme 2 item
  58. Magpul Industries 9 item
  59. Mirzon 7 item
  60. Mission First Tactical 1 item
  61. Modular Evolution LLC 1 item
  62. NIGHT FISION 33 item
  63. Next Level Armament 9 item
  64. Nighthawk Custom 6 item
  65. Nomad Defense 12 item
  66. Norsso 22 item
  67. Noveske 8 item
  68. Odin Works 23 item
  69. Okay Industries 4 item
  70. Otis Technologies 1 item
  71. Overwatch Precision 11 item
  72. Patriot Ordnance Factory (POF) 6 item
  73. Pioneer CNC 2 item
  74. Polymer80 20 item
  75. Primary Arms 4 item
  76. Primary Weapon Systems 4 item
  77. Proof Research 1 item
  78. Radian Weapons 1 item
  79. Rainier Arms, LLC 62 item
  80. Recover Tactical 9 item
  81. Reptilia Corp 1 item
  82. Ruger 1 item
  83. Rugged Suppressor 1 item
  84. SB Tactical 1 item
  85. SCALARWORKS 3 item
  86. SLR Rifleworks 3 item
  87. Seekins Precision 1 item
  88. Sharps Bros 1 item
  89. Shield Arms 1 item
  90. Sig Sauer 27 item
  91. Smartmag 1 item
  92. Smith & Wesson 1 item
  93. Sprinco (Tactical Springs) 9 item
  94. Springer Precision 15 item
  95. Stag Arms 1 item
  96. Stoeger 1 item
  97. Strike Industries 49 item
  98. TXC Holsters 5 item
  99. Tactical Edge Arms 1 item
  100. Tactical Link 2 item
  101. Taylor Freelance 6 item
  102. Timney Triggers 4 item
  103. Toni Systems 12 item
  104. TorkMag 1 item
  105. Triggertech 1 item
  106. Trijicon 15 item
  107. Trinity Nevada 8 item
  108. True Precision 40 item
  109. Tyrant Designs 51 item
  110. Umbrella Corporation 2 item
  111. Venom Defense 1 item
  112. Vortex Optics 3 item
  113. WMD Guns 3 item
  114. Wilson Combat 7 item
  115. ZEV Technologies 85 item
Caliber
  1. .22 LR 1 item
  2. .223 Wylde 1 item
  3. .260 Rem 1 item
  4. .308 3 item
  5. .40 S&W 1 item
  6. .45 ACP 7 item
  7. 300BLK 7 item
  8. 5.56 NATO 14 item
  9. 6.5 Creedmoor 1 item
  10. 7.62x51 10 item
  11. 9mm 151 item
Finish
  1. Alpine Multicam 1 item
  2. Aluminum 2 item
  3. Battleworn 2 item
  4. Black 62 item
  5. Black Anodize 1 item
  6. Black DLC 27 item
  7. Black Nickel Teflon 1 item
  8. Black Nitride 8 item
  9. Black Oxide 1 item
  10. Black/Black 7 item
  11. Black/Nickel 6 item
  12. Black/TiN 7 item
  13. Blue 7 item
  14. Bronze 25 item
  15. Burnt Bronze 1 item
  16. Cerakote 1 item
  17. Chameleon 12 item
  18. Clear 8 item
  19. Cobalt Grey 2 item
  20. Copper 7 item
  21. DLC 45 item
  22. FDE 7 item
  23. FDE DLC 1 item
  24. Glock FDE 2 item
  25. Gold 15 item
  26. Gold Anodize 1 item
  27. Gold TiN 2 item
  28. Gray 7 item
  29. Grey 11 item
  30. Grey DLC 2 item
  31. Grey/Black Camo 1 item
  32. Grey/Black Digital Camo 1 item
  33. MDC (Gray) 15 item
  34. Melonite 3 item
  35. Metallic Gray 1 item
  36. NeoChromatic 1 item
  37. Nickel Boron 2 item
  38. Nitride 10 item
  39. OD Green 2 item
  40. Orange 3 item
  41. PVD/CVD 3 item
  42. Phosphate 1 item
  43. Polished 1 item
  44. Raw 3 item
  45. Red 11 item
  46. Rose 4 item
  47. Rose Gold TiCN 2 item
  48. Satin 1 item
  49. Sig Grey 2 item
  50. Spectrum 8 item
  51. Stainless Steel 53 item
  52. Stealth Grey 10 item
  53. TIN 8 item
  54. TiN (Gold) 46 item
  55. Titan 1 item
  56. Tungsten 2 item
  57. Two-Tone 1 item
  58. White 4 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 5 item
  8. AR-15 40 item
  9. CZ 29 item
  10. FNH 9 item
  11. Glock 491 item
  12. Heckler & Koch 3 item
  13. KS 2 item
  14. Manual Safety 3 item
  15. Multi Cut 4 item
  16. No Safety 3 item
  17. RMR Cut 5 item
  18. Sig Sauer 141 item
  19. Smith & Wesson 32 item
  20. Springfield 13 item
  21. V1 9 item
  22. V2 10 item
  23. V3 6 item
  24. V4 6 item
  25. WA 2 item
  26. Walther 3 item
Configuration
  1. 3 item
  2. .625 DIA 1 item
  3. .750 DIA 4 item
  4. .875 DIA 2 item
  5. .936 DIA 1 item
  6. 1st - 3rd Gen 2 item
  7. 9mm, .40, .357 1 item
  8. AR-10 1 item
  9. AR-15 7 item
  10. Curved 4 item
  11. Enhanced Finger Placement (EFP) 1 item
  12. Flat 2 item
  13. G17 26 item
  14. G19 43 item
  15. G21SF 1 item
  16. G22 1 item
  17. G26 6 item
  18. G34 1 item
  19. G42 1 item
  20. G43 8 item
  21. GEN 4/5 3 item
  22. Gen 1-3 1 item
  23. Gen 3 15 item
  24. Gen 4 17 item
  25. Gen 5 7 item
  26. Glock .40 Cal Gen1-3 1 item
  27. Glock .40 cal Gen4 1 item
  28. Glock 9mm Gen 1-3 1 item
  29. Glock 9mm Gen4 1 item
  30. Glock Gen 5 1 item
  31. Large Backstrap 2 item
  32. M-LOK 12 item
  33. Med Backstrap 2 item
  34. No Backstrap 2 item
  35. P320 12 item
  36. P365 3 item
  37. Right Hand 1 item
  38. Standard 1 item
  39. Straight 4 item
Stock Status
  1. In Stock 497 item
  2. Out of Stock 734 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.