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raineirarms

Rifle Parts

Whether you're building a new rifle from scratch or looking to upgrade an existing firearm, our vast selection of rifle parts has everything you are going to need in that journey. At Rainier Arms' selection of rifle parts, you can find a wide variety of products including lower and upper parts, trigger parts, muzzle devices, and many more. 

Explore our selection of high-quality parts coming from various leading manufacturers like Strike Industries, Magpul, BCM, and many more.

Also, don't forget to check our specially-made Rainier Arms barrels for your firearms.

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Items 1-16 of 822

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  3. Law Tactical Gen 3-M AR Folding Stock Adapter
    Law Tactical Gen 3-M AR Folding Stock Adapter
    $259.99
    Out of stock
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  4. Rainier Arms UltraMatch Billet Upper - MOD 3
    Rainier Arms UltraMatch Billet Upper - MOD 3
    $204.95
    Out of stock
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  5. Hiperfire HIPERTOUCH Reflex, AR15/10 Trigger Assembly
    Hiperfire HIPERTOUCH Reflex, AR15/10 Trigger Assembly
    $213.75
    Out of stock
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  7. Bravo Company MFG (BCM) Lower Group w/ Mod 0 Stock Black
    Bravo Company MFG (BCM) Lower Group w/ Mod 0 Stock Black
    $395.00
    Out of stock
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  8. Surefire Flash Hider - SF3P-556-1/2-28
    Surefire Flash Hider - SF3P-556-1/2-28
    $152.00
    Out of stock
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  9. Lantac UAR Upper Advanced Receiver inc CP-R360 Cam Pin
    Lantac UAR Upper Advanced Receiver inc CP-R360 Cam Pin
    $229.99
    Out of stock
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  11. Battle Arms Development AR-15 BAD556-LW Receiver Set
    Battle Arms Development AR-15 BAD556-LW Receiver Set
    $499.00
    Out of stock
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  12. Geissele Super Sabra Lightning Bow® Trigger
    Geissele Super Sabra Lightning Bow® Trigger
    $104.00
    Out of stock
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  14. ERGO 4 Slot M-LOK Slot Cover 4 Pack
    ERGO 4 Slot M-LOK Slot Cover 4 Pack
    Out of stock
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  15. Geissele Super Scar Trigger
    Geissele Super Scar Trigger
    $330.00
    Out of stock
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  16. Magpul Zhukov-S AK47/74 Stock - Black
    Magpul Zhukov-S AK47/74 Stock - Black
    $104.45
    Out of stock
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Items 1-16 of 822

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Shopping Options
Barrel Length
  1. 5.25" 1 item
  2. 5.5" 6 items
  3. 6" 1 item
  4. 6.5" 1 item
  5. 7" 1 item
  6. 7.5" 2 items
  7. 7.94" 1 item
  8. 8" 4 items
  9. 8.3" 3 items
  10. 8.5" 6 items
  11. 9" 4 items
  12. 9.5" 1 item
  13. 9.75" 1 item
  14. 10.3" 5 items
  15. 10.5" 10 items
  16. 10.7" 1 item
  17. 11" 1 item
  18. 11.5" 8 items
  19. 11.85" 2 items
  20. 12" 6 items
  21. 12.5" 6 items
  22. 13" 1 item
  23. 13.7" 3 items
  24. 13.9" 2 items
  25. 14.5" 8 items
  26. 16" 47 items
  27. 16.1" 1 item
  28. 16.3" 1 item
  29. 18" 22 items
  30. 20" 11 items
  31. 22" 12 items
  32. 24" 1 item
Barrel Profile
  1. Dissipator 2 items
  2. DMR 1 item
  3. MK12 SPR 6 items
  4. Non-fluted 1 item
Caliber
  1. .22 ARC 3 items
  2. .223/5.56 5 items
  3. .223 Wylde 17 items
  4. .30-30 1 item
  5. .30 Cal 4 items
  6. .308 6 items
  7. .308 Win 12 items
  8. .338 1 item
  9. .38/.357 Magnum 1 item
  10. .45 ACP 1 item
  11. .458 Socom 1 item
  12. 300 Blackout 27 items
  13. 5.56X45 5 items
  14. 5.56 NATO 66 items
  15. 5.56mm 3 items
  16. 6mm ARC 9 items
  17. 6.5 Creedmoor 5 items
  18. 6.5 Grendel 4 items
  19. 6MM Creedmoor 8 items
  20. 7.62mm 3 items
  21. 7.62x39 3 items
  22. 7.62x51 2 items
  23. 8.6 Blackout 7 items
  24. 9mm 28 items
Category
  1. Receiver Parts 180 items
  2. Parts & Kits 93 items
  3. Barrels 103 items
  4. Buffer Systems 35 items
  5. Trigger Parts 52 items
  6. Gas Systems 25 items
  7. Muzzle Devices 78 items
  8. Bolt Parts 49 items
  9. Grips 46 items
  10. Charging Handles 29 items
  11. Rifle Handguards 80 items
  12. Stocks & Braces 51 items
  13. MILSPEC Parts 4 items
Co Witness
  1. Lower 1/3 1 item
Color
Configuration
  1. AR-10 2 items
  2. AR-15 11 items
  3. Curved 4 items
  4. Flat 3 items
  5. Left 1 item
  6. Left Hand 1 item
  7. M-LOK 4 items
  8. Rifle 1 item
  9. Straight 1 item
  10. .625 DIA 3 items
  11. .750 DIA 5 items
  12. .936 DIA 1 item
Finish
  1. Arid 1 item
  2. Black 3 items
  3. Black Nitride 3 items
  4. Cerakote 6 items
  5. Chrome 1 item
  6. DLC 4 items
  7. FDE 1 item
  8. Melonite 1 item
  9. NiB-X 1 item
  10. Nickel Boron 3 items
  11. Nitride 35 items
  12. Nitromet 1 item
  13. Phosphate 2 items
  14. Polished 10 items
  15. Satin 25 items
  16. Anodize 30 items
  17. Quench Polish Quench (QPQ) 4 items
  18. Titanium Nitride (TiN) 2 items
Gas Block Diameter
  1. .625" 7 items
  2. .750" 82 items
  3. .875" 9 items
  4. .936" 1 item
Gas System Length
  1. Blowback 8 items
  2. Pistol 14 items
  3. Carbine 21 items
  4. Mid 46 items
  5. Intermediate 9 items
  6. Rifle 20 items
  7. Rifle +1 4 items
  8. Rifle +2 3 items
Height
  1. Absolute Co-Witness 2 items
Inside Diameter
  1. 1.3" 1 item
  2. 1.315" 3 items
  3. 1.34" 2 items
  4. 1.35" 1 item
  5. 1.4" 1 item
  6. 1.42" 1 item
  7. 1.45" 1 item
  8. 1.5" 1 item
  9. 1.55" 1 item
Is Firearms?
  1. No 822 items
Manufacturer
  1. A3 Tactical 12 items
  2. Accu-Tac 1 item
  3. Advanced Armament Company (AAC) 1 item
  4. Aero Precision 54 items
  5. Aeroknox 8 items
  6. Agency Arms 1 item
  7. ALG Defense 1 item
  8. Angstadt Arms 9 items
  9. Apex Tactical Specialties 1 item
  10. Armaspec 9 items
  11. Arms Republic 6 items
  12. Ascalon Arms 4 items
  13. Brügger & Thomet (B&T) 3 items
  14. B5 Systems 4 items
  15. Ballistic Advantage 25 items
  16. Battle Arms Development 33 items
  17. Blackout Defense 8 items
  18. Blitzkrieg Components 3 items
  19. Bootleg 2 items
  20. Bravo Company MFG (BCM) 32 items
  21. Centurion Arms 7 items
  22. Chisel Machining 1 item
  23. Cross Machine Tool (CMT) 8 items
  24. Daniel Defense 6 items
  25. Dead Air Armament 1 item
  26. Dead Foot Arms LLC 3 items
  27. Drew Meyers Defense 1 item
  28. Elftmann Tactical 1 item
  29. Emissary Development 3 items
  30. Ergo Grips 7 items
  31. F5 MFG 9 items
  32. Faxon Firearms 44 items
  33. Ferfrans 1 item
  34. Flatline Fiber Co 1 item
  35. Fortis MFG 13 items
  36. Forward Controls Design 9 items
  37. FosTecH 2 items
  38. Gear Head Works 2 items
  39. Geissele 23 items
  40. Griffin Armament 10 items
  41. HB Industries 7 items
  42. HERA ARMS 5 items
  43. Heresy Design 1 item
  44. Hiperfire 11 items
  45. HUXWRX 2 items
  46. James Madison Tactical (JMT) 1 item
  47. JK Armament 2 items
  48. JMAC Customs 10 items
  49. JP Enterprises Inc 19 items
  50. Kinetic Development Group 5 items
  51. Knight’s Armament Company (KAC) 15 items
  52. KNS Precision 1 item
  53. Kalashnikov USA 2 items
  54. Krebs Customs 3 items
  55. KynSHOT 2 items
  56. Lantac 10 items
  57. Law Tactical 1 item
  58. Lee Sporting 4 items
  59. Leitner-Wise 1 item
  60. Lewis Machine & Tool (LMT) 13 items
  61. Mad Pig 1 item
  62. Mag-Pod 1 item
  63. Magpul Industries 9 items
  64. Maxim Defense 5 items
  65. Midwest Industries 19 items
  66. NEMO Arms 5 items
  67. Next Level Armament 7 items
  68. Noveske 26 items
  69. Obsidian Arms 1 item
  70. Patriot Ordnance Factory (POF) 1 item
  71. Precision Armament 6 items
  72. Primary Weapon Systems 10 items
  73. Q, LLC 8 items
  74. Radian Weapons 6 items
  75. Raidworx 1 item
  76. Rainier Arms, LLC 60 items
  77. Reptilia Corp 5 items
  78. Rise Armament 5 items
  79. RS Regulate 1 item
  80. SB Tactical 6 items
  81. Sharps Bros 8 items
  82. Sig Sauer 6 items
  83. Silencerco 8 items
  84. Sionics Weapon Systems 5 items
  85. SLR Rifleworks 4 items
  86. Sons of Liberty Gun Works 12 items
  87. Spinta Precision 3 items
  88. Springer Precision 1 item
  89. Stag Arms 1 item
  90. Stern Defense 3 items
  91. Strike Industries 1 item
  92. Superlative Arms 1 item
  93. Surefire 12 items
  94. Taran Tactical Innovations 2 items
  95. Timney Triggers 5 items
  96. Triggertech 2 items
  97. Troy Industries 7 items
  98. TruCalibre 3 items
  99. Tyrant Designs 5 items
  100. V Seven Weapon Systems 34 items
  101. VLTOR 6 items
  102. WMD Guns 6 items
  103. WOOX 1 item
Model
  1. CZ Bren 2 items
  2. CZ Scorpion 6 items
  3. FNH Scar 1 item
  4. H&K G36 1 item
  5. IWI Galil 1 item
  6. Remington 700 4 items
  7. Sig MCX 4 items
  8. Sig MPX 1 item
Mount
  1. KeyMod 9 items
  2. M-LOK 72 items
  3. Picatinny 29 items
Optic Footprint
  1. Aimpoint Acro 1 item
Option
  1. AK-47/74 4 items
  2. AR-9 7 items
  3. AR-10 18 items
  4. AR-15 129 items
  5. H2 Buffer 1 item
  6. SRS-C 3.3 oz. 1 item
  7. SRS-H 3.8 oz. 1 item
  8. SRS-H2 4.7 oz. 1 item
  9. SRS-H3 5.6 oz. 1 item
  10. SRS-BB 5.7 oz. 1 item
  11. SRS-9mm 6.4 oz. 1 item
  12. SRS-AR10 5.7 oz. 1 item
  13. Remington 700 Short Action BDL 1 item
  14. Remington 700 Long Action BDL 1 item
  15. Sauer 100 1 item
  16. WA 1 item
  17. KS 1 item
  18. 9mm 1 item
  19. CZ 11 items
  20. FNH 1 item
  21. Glock 3 items
  22. Heckler & Koch 1 item
  23. Remington 1 item
  24. Sharps Bros 1 item
  25. Small Lever 1 item
  26. Large Lever 2 items
  27. AKM 1 item
  28. Green Laser 1 item
  29. Adjustable 4 items
  30. Non-Adjustable 13 items
  31. MCS 2 items
  32. Full Size 2 items
  33. IWI Uzi Pro 1 item
Platform
  1. AR-10/LR308 16 items
  2. AR-15 129 items
  3. AK47/74 5 items
  4. CZ 6 items
  5. FNH 1 item
  6. IWI 1 item
  7. Remington 4 items
  8. Remington 700 6 items
  9. Ruger Precision Rifle 1 item
  10. Savage Small Shank 8 items
  11. Sig Sauer 6 items
  12. Sig MPX 1 item
  13. Steyr Aug 1 item
Price
  1. $0.00 - $999.99 795 items
  2. $1,000.00 - $1,999.99 26 items
  3. $2,000.00 and above 1 item
Product Type
  1. 80% Lower 2 items
  2. Accessory 1 item
  3. Angled Grip 7 items
  4. Anti Walk Pins 3 items
  5. AR-10/LR308 Barrel 13 items
  6. AR-10 / LR 308 Charging Handle 3 items
  7. AR-10 Complete Upper Receiver 1 item
  8. AR-10 Partial Upper Receiver 1 item
  9. AR-10 Handguard 6 items
  10. AR-10 Receiver Set 3 items
  11. AR-10 Stripped Lower Receiver 2 items
  12. AR-10 Stripped Upper Receiver 3 items
  13. AR-15 Assembled Upper Receiver 3 items
  14. AR-15 Barrel 72 items
  15. AR-15 Charging Handle 14 items
  16. AR-15 Complete Lower Receiver 22 items
  17. AR-15 Complete Upper Receiver 29 items
  18. AR-15 Partial Upper Receiver 25 items
  19. AR-15 Handguard 32 items
  20. AR-15 Receiver Set 10 items
  21. AR-15 Stripped Lower Receiver 29 items
  22. AR-15 Stripped Upper Receiver 23 items
  23. AR-15 Upper Receiver Group 1 item
  24. AR-9 Lower Receiver 4 items
  25. AR-9 Complete Lower Receiver 1 item
  26. AR-9 Receiver Set 1 item
  27. AR-9 Upper Receiver 4 items
  28. Barrel Nut 3 items
  29. Blast Shield 3 items
  30. Bolt 5 items
  31. Bolt-Action Barrel 16 items
  32. Bolt Carrier Group 40 items
  33. Bolt Catch 5 items
  34. Brace 9 items
  35. Brace Strap 1 item
  36. Buffer 8 items
  37. Buffer Kit 8 items
  38. Buffer Spring 8 items
  39. Buffer Tube 10 items
  40. Builders Kit 1 item
  41. Castle Nut / End Plate 2 items
  42. Charging Handle 10 items
  43. Chassis 3 items
  44. Compensator 9 items
  45. Complete Upper 9 items
  46. Dust Cover 2 items
  47. End Cap 2 items
  48. Firing Pin 3 items
  49. Flash Hider 17 items
  50. Forearm Accesory 6 items
  51. Forward Assist 4 items
  52. Gas Block 20 items
  53. Gas Tube 2 items
  54. Grip Accessory 1 item
  55. Grip Module 1 item
  56. Gunsmithing Tool 1 item
  57. Handguard 23 items
  58. Handgun 1 item
  59. Handstop 12 items
  60. Iron Sight 1 item
  61. Lower Parts Kit 11 items
  62. Lower Receiver 4 items
  63. Magazine Catch 1 item
  64. Magazine Release 8 items
  65. Magwell 1 item
  66. Muzzle Brake 40 items
  67. Muzzle Device Accessory 9 items
  68. Patch 1 item
  69. Pistol Grip 11 items
  70. Piston System 2 items
  71. Port Door Rod 4 items
  72. Rail Adapter 5 items
  73. Rail Cover 1 item
  74. Rail Panel 3 items
  75. Rail Section 2 items
  76. Recoil Spring 1 item
  77. Retainer Pin 1 item
  78. Safety Selector 25 items
  79. Scope Mount 1 item
  80. Shim Set 2 items
  81. Sig MPX Barrel 1 item
  82. Sight Post 1 item
  83. Sling Mount 2 items
  84. Spring 1 item
  85. Steyr Aug Barrel 1 item
  86. Stock 27 items
  87. Stock Accessory 6 items
  88. Stock Adapter 6 items
  89. Suppressor Accessory 1 item
  90. Take Down / Pivot Pins 9 items
  91. Trigger 43 items
  92. Trigger / Hammer Pins 2 items
  93. Trigger Guard 2 items
  94. Trigger Spring 1 item
  95. Upper Parts Kit 1 item
  96. Vertical Grip 11 items
  97. Weight 1 item
Rail Length
  1. 3" 1 item
  2. 4" 1 item
  3. 5" 1 item
  4. 5.5" 1 item
  5. 6.0" 2 items
  6. 6.25" 1 item
  7. 6.7" 4 items
  8. 6.91" 1 item
  9. 7" 9 items
  10. 7.25" 1 item
  11. 8" 2 items
  12. 8.25" 1 item
  13. 9" 4 items
  14. 9.25" 1 item
  15. 9.5" 7 items
  16. 9.55" 1 item
  17. 9.6" 3 items
  18. 9.75" 1 item
  19. 10" 11 items
  20. 10.25" 1 item
  21. 10.5" 6 items
  22. 10.7" 1 item
  23. 10.75" 1 item
  24. 11" 2 items
  25. 11.5" 3 items
  26. 11.7" 1 item
  27. 12" 10 items
  28. 12.25" 1 item
  29. 12.4" 2 items
  30. 12.5" 4 items
  31. 12.625" 1 item
  32. 13" 7 items
  33. 13.5" 4 items
  34. 13.625" 1 item
  35. 13.7" 5 items
  36. 13.8" 2 items
  37. 14" 2 items
  38. 15" 31 items
  39. 15.3" 2 items
  40. 16" 1 item
  41. 16.5" 1 item
  42. 17" 1 item
  43. 18" 1 item
Size
  1. BACK STRAP:Large 1 item
  2. BACK STRAP:Medium 2 items
  3. 3 Slot 2 items
  4. 5 Slot 2 items
  5. 7 Slot 2 items
  6. 9 Slot 12 items
Thread Pitch
  1. 1.125x28 1 item
  2. 1.375-24 1 item
  3. 1/2x28 (9mm) 13 items
  4. 1/2x28 (.22 cal) 92 items
  5. 1/2x36 2 items
  6. 3/4x24 1 item
  7. 5/8x24 (.30 cal) 70 items
  8. 5/8x32 1 item
  9. 11/16x24 1 item
  10. M18x1.5 2 items
  11. M24x1.5 RH 1 item
Threaded
  1. Yes 29 items
  2. No 2 items
Twist Rate
  1. 1:3 4 items
  2. 1:5 1 item
  3. 1:6 1 item
  4. 1:7 58 items
  5. 1:7.5 14 items
  6. 1:8 29 items
  7. 1:10 23 items
Stock Status
  1. In stock 9 items
  2. Out of stock 813 items Remove This Item
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