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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 17-32 of 695

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  1. Ballistic Advantage AR-15 Enhanced Lower Receiver
    Ballistic Advantage AR-15 Enhanced Lower Receiver
    $90.24
    Out of stock
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  2. Ballistic Advantage AR-15 Stripped Lower Receiver
    Ballistic Advantage AR-15 Stripped Lower Receiver
    $80.75
    Out of stock
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  3. JP Enterprises PSC-17 Completion Dual-Charge Upper Receiver Assembly w/ Radian Raptor LT - Black
    JP Enterprises PSC-17 Completion Dual-Charge Upper Receiver Assembly w/ Radian Raptor LT - Black
    $793.25
    Out of stock
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  4. Midwest Industries Slim Line AR-15 M-Lok Handguard - 10.5"
    Midwest Industries Slim Line AR-15 M-Lok Handguard - 10.5"
    $162.95
    Out of stock
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  5. Troy Industries Tritium Micro Folding Battlesights - HK Front & Round Rear
    Troy Industries Tritium Micro Folding Battlesights - HK Front & Round Rear
    $303.00
    Out of stock
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  6. Troy Industries Battleready Series PDW Stock Kit - Full
    Troy Industries Battleready Series PDW Stock Kit - Full
    $524.00
    Out of stock
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  7. Aero Precision AR15 Enhanced Carbine Buffer Kit
    Aero Precision AR15 Enhanced Carbine Buffer Kit
    $76.99
    Out of stock
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  8. Ballistic Advantage AR-15 Upper Receiver w/ Logo
    Ballistic Advantage AR-15 Upper Receiver w/ Logo
    $90.25
    Out of stock
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  9. Ballistic Advantage AR-15 Enhanced Upper Receiver
    Ballistic Advantage AR-15 Enhanced Upper Receiver
    $113.99
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  10. Ballistic Advantage BA-10 Upper Receiver
    Ballistic Advantage BA-10 Upper Receiver
    $142.50
    Out of stock
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  11. Rainier Arms Exclusive Spinta Precision AR-15 9mm Thermal Barrel - 5.25” Nitride (Rainier Arms Exclusive)
    Spinta Precision AR-15 9mm Thermal Barrel - 5.25” Nitride (Rainier Arms Exclusive)
    Special Price $77.99 Regular Price $149.99
    Out of stock
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  12. Rainier Arms Exclusive Spinta Precision .223 Wylde Dissipator Barrel - 16" (Rainier Arms Exclusive)
    Spinta Precision .223 Wylde Dissipator Barrel - 16" (Rainier Arms Exclusive)
    Special Price $149.99 Regular Price $199.99
    Out of stock
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  13. Midwest Industries Picatinny Side Folder - Milspec Buffer Tube
    Midwest Industries Picatinny Side Folder - Milspec Buffer Tube
    $146.95
    Out of stock
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  14. Midwest Industries Picatinny Side Folder - Buffer Tube Adapter
    Midwest Industries Picatinny Side Folder - Buffer Tube Adapter
    $110.95
    Out of stock
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  15. Angstadt Arms 9mm AR-15 Barrel - 6"
    Angstadt Arms 9mm AR-15 Barrel - 6"
    $108.00
    Out of stock
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  16. Ballistic Advantage .308 Bolt Carrier Group - NiB
    Ballistic Advantage .308 Bolt Carrier Group - NiB
    $251.75
    Out of stock
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Barrel Length
  1. 3.66" 1 item
  2. 4" 1 item
  3. 5.5" 1 item
  4. 6" 1 item
  5. 6.5" 1 item
  6. 7" 1 item
  7. 8" 4 items
  8. 8.3" 3 items
  9. 8.5" 4 items
  10. 9" 4 items
  11. 10.3" 1 item
  12. 10.5" 9 items
  13. 11" 1 item
  14. 11.5" 7 items
  15. 12" 3 items
  16. 12.5" 5 items
  17. 13.7" 3 items
  18. 13.9" 1 item
  19. 14.5" 8 items
  20. 16" 30 items
  21. 16.3" 1 item
  22. 18" 14 items
  23. 20" 12 items
  24. 22" 11 items
Barrel Profile
  1. Full-fluted 2 items
  2. Non-fluted 2 items
Caliber
  1. .22 ARC 2 items
  2. .223/5.56 4 items
  3. .223 Wylde 5 items
  4. .30-30 1 item
  5. .30 Cal 5 items
  6. .308 4 items
  7. .308 Win 5 items
  8. .338 1 item
  9. .357 Magnum 2 items
  10. .38/.357 Magnum 1 item
  11. .44/.45 2 items
  12. .45-70 GOVT 2 items
  13. .45 ACP 1 item
  14. .458 Socom 2 items
  15. 300 Blackout 16 items
  16. 5.56X45 4 items
  17. 5.56 NATO 49 items
  18. 5.56mm 2 items
  19. 6mm ARC 3 items
  20. 6.5 Creedmoor 6 items
  21. 6.5 Grendel 3 items
  22. 6MM Creedmoor 6 items
  23. 7.62mm 4 items
  24. 7.62x39 1 item
  25. 7.62x51 3 items
  26. 8.6 Blackout 2 items
  27. 9mm 26 items
Category
  1. Receiver Parts 145 items
  2. Parts & Kits 68 items
  3. Barrels 15 items
  4. Rifle Barrels 66 items
  5. Buffer Systems 23 items
  6. Trigger Parts 59 items
  7. Gas Systems 19 items
  8. Muzzle Devices 70 items
  9. Bolt Parts 44 items
  10. Grips 40 items
  11. Charging Handles 21 items
  12. Rifle Handguards 76 items
  13. Stocks & Braces 43 items
  14. MILSPEC Parts 4 items
Co Witness
  1. Lower 1/3 1 item
Color
Configuration
  1. AR-10 1 item
  2. AR-15 11 items
  3. Carbine 1 item
  4. Cross 1 item
  5. Curved 7 items
  6. Flaming Pig 1 item
  7. Flat 9 items
  8. Gen 1-3 1 item
  9. GEN 2 1 item
  10. Ghetto Blaster 1 item
  11. M-LOK 3 items
  12. M4 Curve 1 item
  13. Rifle 1 item
  14. Straight 1 item
  15. .625 DIA 2 items
  16. .750 DIA 16 items
  17. .936 DIA 1 item
  18. Standard Buffer and Spring 1 item
Finish
  1. Bead Blast 1 item
  2. Black 6 items
  3. Black Nitride 3 items
  4. Cerakote 5 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 6 items
  11. Nitride 15 items
  12. Nitromet 1 item
  13. Phosphate 2 items
  14. Polished 5 items
  15. Satin 7 items
  16. Anodize 24 items
  17. Clear Hard Anodize 3 items
  18. Quench Polish Quench (QPQ) 3 items
  19. Titanium Nitride (TiN) 2 items
Gas Block Diameter
  1. .625" 3 items
  2. .750" 34 items
  3. .875" 5 items
Gas Length
  1. Pistol 9 items
  2. Carbine 14 items
  3. Mid 29 items
  4. Intermediate 9 items
  5. Rifle 11 items
  6. Rifle +1 2 items
  7. Rifle +2 3 items
Height
  1. Absolute Co-Witness 1 item
Inside Diameter
  1. 1.315" 3 items
  2. 1.34" 2 items
  3. 1.42" 1 item
  4. 1.45" 1 item
  5. 1.5" 1 item
  6. 1.55" 1 item
Manufacturer
  1. A3 Tactical 12 items
  2. Advanced Armament Company (AAC) 1 item
  3. Aero Precision 48 items
  4. Aeroknox 8 items
  5. Agency Arms 1 item
  6. ALG Defense 2 items
  7. Angstadt Arms 10 items
  8. Apex Tactical Specialties 1 item
  9. Armaspec 8 items
  10. Arms Republic 4 items
  11. Ascalon Arms 4 items
  12. B5 Systems 1 item
  13. Ballistic Advantage 24 items
  14. Battle Arms Development 35 items
  15. Blackout Defense 8 items
  16. Blitzkrieg Components 6 items
  17. Bootleg 2 items
  18. Bravo Company MFG (BCM) 27 items
  19. Centurion Arms 10 items
  20. Chisel Machining 1 item
  21. Cross Machine Tool (CMT) 8 items
  22. Daniel Defense 1 item
  23. Dead Air Armament 1 item
  24. Dead Foot Arms LLC 3 items
  25. Drew Meyers Defense 4 items
  26. Driven Arms Co. 2 items
  27. Elftmann Tactical 1 item
  28. Emissary Development 1 item
  29. Ergo Grips 7 items
  30. F5 MFG 12 items
  31. Faxon Firearms 37 items
  32. Fortis MFG 10 items
  33. Forward Controls Design 5 items
  34. FosTecH 2 items
  35. Gear Head Works 1 item
  36. Geissele 19 items
  37. Grey Birch MFG 6 items
  38. Griffin Armament 5 items
  39. HB Industries 3 items
  40. HERA ARMS 7 items
  41. Heresy Design 1 item
  42. Hiperfire 15 items
  43. HUXWRX 5 items
  44. Icon Defense 1 item
  45. James Madison Tactical (JMT) 1 item
  46. JK Armament 1 item
  47. JMAC Customs 7 items
  48. JP Enterprises Inc 6 items
  49. Kinetic Development Group 5 items
  50. Knight’s Armament Company (KAC) 14 items
  51. KNS Precision 4 items
  52. Kalashnikov USA 2 items
  53. Krebs Customs 2 items
  54. KynSHOT 2 items
  55. Lantac 16 items
  56. Law Tactical 1 item
  57. Lee Sporting 4 items
  58. Lewis Machine & Tool (LMT) 7 items
  59. Mad Pig 1 item
  60. Magpul Industries 10 items
  61. Matador Arms 1 item
  62. Maxim Defense 1 item
  63. Midwest Industries 23 items
  64. NEMO Arms 4 items
  65. Next Level Armament 5 items
  66. Noveske 25 items
  67. Obsidian Arms 1 item
  68. Patriot Ordnance Factory (POF) 2 items
  69. Precision Armament 5 items
  70. Primary Weapon Systems 6 items
  71. Q, LLC 4 items
  72. R&D Precision 1 item
  73. Radian Weapons 2 items
  74. Rainier Arms, LLC 36 items
  75. SB Tactical 3 items
  76. Sharps Bros 8 items
  77. Sig Sauer 2 items
  78. Silencerco 9 items
  79. Sionics Weapon Systems 5 items
  80. SLR Rifleworks 4 items
  81. Sons of Liberty Gun Works 8 items
  82. Spinta Precision 4 items
  83. Springer Precision 1 item
  84. Stern Defense 6 items
  85. Strike Industries 1 item
  86. Surefire 8 items
  87. Taran Tactical Innovations 1 item
  88. Timney Triggers 1 item
  89. Triggertech 6 items
  90. Troy Industries 7 items
  91. TruCalibre 3 items
  92. Tyrant Designs 4 items
  93. V Seven Weapon Systems 12 items
  94. VLTOR 5 items
  95. WMD Guns 4 items
  96. WOOX 1 item
Model
  1. CZ Scorpion 6 items
  2. FNH Scar 1 item
  3. IWI Galil 1 item
  4. Remington 700 1 item
  5. Sig MCX 4 items
  6. Sig MPX 1 item
Mount
  1. KeyMod 7 items
  2. M-LOK 54 items
  3. Picatinny 25 items
Option
  1. AK-47/74 5 items
  2. AR-9 8 items
  3. AR-10 16 items
  4. AR-15 114 items
  5. Standard 3 items
  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. Small Lever 1 item
  24. Large Lever 2 items
  25. AKM 1 item
  26. Adjustable 3 items
  27. Non-Adjustable 14 items
  28. MCS 2 items
  29. Full Size 2 items
  30. Dimpled 1 item
Platform
  1. AR-10 3 items
  2. AR-15 49 items
  3. AK47/74 5 items
  4. CZ-USA 7 items
  5. FNH 1 item
  6. IWI 1 item
  7. Remington 1 item
  8. Remington 700 5 items
  9. Ruger 4 items
  10. Savage Small Shank 5 items
  11. Sig Sauer 6 items
Price
  1. $0.00 - $99.99 239 items
  2. $100.00 - $199.99 171 items
  3. $200.00 - $299.99 124 items
  4. $300.00 - $399.99 47 items
  5. $400.00 - $499.99 60 items
  6. $500.00 - $599.99 18 items
  7. $600.00 - $699.99 10 items
  8. $700.00 - $799.99 19 items
  9. $800.00 - $899.99 4 items
  10. $900.00 and above 3 items
Product Type
  1. 80% Lower 2 items
  2. Accessory 2 items
  3. Angled Grip 6 items
  4. Anti Walk Pins 3 items
  5. AR-10 Barrel 1 item
  6. AR-10 / LR 308 Charging Handle 2 items
  7. AR-10 Partial Upper Receiver 1 item
  8. AR-10 Handguard 5 items
  9. AR-10 Receiver Set 3 items
  10. AR-10 Stripped Lower Receiver 2 items
  11. AR-10 Stripped Upper Receiver 3 items
  12. AR-15 Assembled Upper Receiver 2 items
  13. AR-15 Barrel 2 items
  14. AR-15 Charging Handle 10 items
  15. AR-15 Complete Lower Receiver 22 items
  16. AR-15 Complete Upper Receiver 6 items
  17. AR-15 Partial Upper Receiver 19 items
  18. AR-15 Handguard 31 items
  19. AR-15 Receiver Set 7 items
  20. AR-15 Stripped Lower Receiver 23 items
  21. AR-15 Stripped Upper Receiver 20 items
  22. AR-9 Lower Receiver 4 items
  23. AR-9 Complete Lower Receiver 1 item
  24. AR-9 Receiver Set 1 item
  25. AR-9 Upper Receiver 7 items
  26. Barrel 65 items
  27. Blast Shield 2 items
  28. Bolt 6 items
  29. Bolt-Action Barrel 10 items
  30. Bolt Carrier Group 34 items
  31. Bolt Catch 6 items
  32. Brace 6 items
  33. Buffer 10 items
  34. Buffer Kit 5 items
  35. Buffer Spring 1 item
  36. Buffer Tube 6 items
  37. Builders Kit 1 item
  38. Cam Pin 1 item
  39. Charging Handle 6 items
  40. Chassis 9 items
  41. Compensator 7 items
  42. Complete Upper 6 items
  43. Dust Cover 1 item
  44. End Plate 3 items
  45. Firing Pin 2 items
  46. Flash Hider 17 items
  47. Forearm Accesory 4 items
  48. Forward Assist 1 item
  49. Gas Block 15 items
  50. Gas Tube 2 items
  51. Grip Accessory 1 item
  52. Grip Module 1 item
  53. Gunsmithing Tool 1 item
  54. Handguard 26 items
  55. Handgun 1 item
  56. Handstop 14 items
  57. Iron Sight 1 item
  58. Lower Parts Kit 9 items
  59. Lower Receiver 4 items
  60. Magazine Catch 2 items
  61. Magazine Release 5 items
  62. Magwell 1 item
  63. Muzzle Brake 38 items
  64. Muzzle Device Accessory 6 items
  65. Parts Kit 1 item
  66. Patch 1 item
  67. Pistol Grip 12 items
  68. Piston System 1 item
  69. Port Door 1 item
  70. Rail Adapter 2 items
  71. Rail Panel 2 items
  72. Rail Section 2 items
  73. Recoil Spring 1 item
  74. Retainer Pin 1 item
  75. Safety Selector 17 items
  76. Scope Mount 1 item
  77. Shim Set 2 items
  78. Sight Post 4 items
  79. Sling Mount 2 items
  80. Stock 25 items
  81. Stock Accessory 4 items
  82. Stock Adapter 6 items
  83. Take Down / Pivot Pins 6 items
  84. Trigger 50 items
  85. Trigger Guard 3 items
  86. Trigger Spring 1 item
  87. Upper Parts Kit 1 item
  88. Vertical Grip 6 items
  89. Weight 1 item
Rail Length
  1. 3" 1 item
  2. 4" 1 item
  3. 5" 2 items
  4. 5.5" 1 item
  5. 6.0" 2 items
  6. 6.25" 1 item
  7. 6.7" 4 items
  8. 7" 3 items
  9. 7.25" 1 item
  10. 8" 2 items
  11. 8.25" 1 item
  12. 9" 3 items
  13. 9.5" 4 items
  14. 9.55" 1 item
  15. 9.6" 3 items
  16. 10" 14 items
  17. 10.5" 5 items
  18. 10.7" 1 item
  19. 10.75" 1 item
  20. 11.5" 2 items
  21. 12" 14 items
  22. 12.25" 1 item
  23. 12.4" 2 items
  24. 12.5" 2 items
  25. 12.625" 1 item
  26. 13" 8 items
  27. 13.5" 2 items
  28. 13.6" 4 items
  29. 13.625" 2 items
  30. 13.7" 4 items
  31. 13.8" 2 items
  32. 14" 2 items
  33. 15" 23 items
  34. 15.3" 2 items
  35. 16" 1 item
  36. 16.5" 1 item
  37. 17" 1 item
  38. 18" 1 item
Size
  1. 35mm rings 3 items
  2. BACK STRAP:Large 1 item
  3. BACK STRAP:Medium 2 items
  4. 3 Slot 2 items
  5. 5 Slot 2 items
  6. 7 Slot 2 items
  7. 9 Slot 12 items
Thread Pitch
  1. 1.125x28 1 item
  2. 1.375-24 1 item
  3. 1/2x28 65 items
  4. 1/2x36 1 item
  5. 5/8x24 42 items
  6. 5/8x32 1 item
  7. 11/16x24 1 item
  8. M24x1.5 RH 2 items
Threaded
  1. Yes 28 items
Twist Rate
  1. 1:3 1 item
  2. 1:7 24 items
  3. 1:7.5 5 items
  4. 1:8 8 items
  5. 1:10 10 items
Stock Status
  1. In stock 2 items
  2. Out of stock 693 items Remove This Item
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