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Lower Parts Kit | AR 15 Lower Part Kits or AR 10 Lower Part Kits from Brands like CMMG, Guntec & More | Free Shipping Available! — 1,535 products / 4,085 models

All Lower Parts Kits are not created equal. This critical component is mil-spec'd to be the very best. Whether you want a trigger or pistol grip these Lower Parts Kits are easy to assemble and the perfect addition to any modification. Enhance your lover receiver with a Lower Parts Kit featuring triggers, AR15 Barrels, hammers, disconnectors are more essential Gun Parts for your next build out. Machined from the highest-quality materials these Lower Parts Kits are compatible with most AR15 and variant lower receivers. Featuring top brands such as CMMG, Inc, Aero Precision, and Guntec USA a Lower Parts Kit is crucial to keeping your rifle running smoothly. Check out our Sale & Closeout Prices for even more great deals on the gear you want and need most. As always, OpticsPlanet is thrilled to offer their most valued of customers Free Shipping On Orders Over $49.image

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Image of Radian Weapons Talon Ambidextrous Safety Selector 2-Lever KIT made-in-usa-flag 2 models Radian Weapons Talon Ambidextrous Safety Selector 2-Lever KIT (250) As Low As (Save Up to 30%) $64.95 Best Rated
Image of AT3 Tactical FU-BAG AR-15 Lost Parts Kit AT3 Tactical FU-BAG AR-15 Lost Parts Kit (81) List: $11.99 (Save $1.00) $10.99 Best Rated
Image of RISE Armament Lower Parts Kit Ar-15 Minus Trigger RISE Armament Lower Parts Kit Ar-15 Minus Trigger (45) List: $67.26 (Save 33%) $44.99 Best Rated
Image of Strike Industries AR Enhanced Lower Receiver Parts Less Trigger, Hammer and Disconnector Strike Industries AR Enhanced Lower Receiver Parts Less Trigger, Hammer and Disconnector (96) List: $55.95 (Save $2.00) $53.95 5% Bonus Bucks
Image of Geissele Ultra Duty Lower Parts Kit made-in-usa-flag 2 models Geissele Ultra Duty Lower Parts Kit (57) As Low As (Save Up to 22%) $147.90 Free 2 Day Shipping
Image of Kaw Valley Precision Stainless Steel Heavy Tungsten Buffer Kaw Valley Precision Stainless Steel Heavy Tungsten Buffer (19) List: $69.95 (Save 21%) $54.95 Best Rated
Image of JP Enterprises SCS System Buffer Retainer Pin & Spring Kit JP Enterprises SCS System Buffer Retainer Pin & Spring Kit (48) List: $12.95 $12.30 10% Bonus Bucks
Image of Primary Weapons Systems EBT Mod 2 End Plate and Castle Nut Primary Weapons Systems EBT Mod 2 End Plate and Castle Nut (112) List: $49.95 (Save 26%) $36.75 Best Rated
Image of Strike Industries AR-10 Enhanced Lower Receiver Parts Less Trigger/Hammer and Disconnector Strike Industries AR-10 Enhanced Lower Receiver Parts Less Trigger/Hammer and Disconnector (19) List: $59.95 (Save 10%) $53.95 Best Rated
Image of Primary Weapons Systems PWS Enhanced Buffer Tube, Mil-Spec Gen 2 Ratchet Lock Endplate Primary Weapons Systems PWS Enhanced Buffer Tube, Mil-Spec Gen 2 Ratchet Lock Endplate (96) List: $109.95 (Save $10.00) $99.95 Best Rated
Image of Strike Industries AR Enhanced Lower Receiver Parts with Trigger, Hammer and Disconnector Strike Industries AR Enhanced Lower Receiver Parts with Trigger, Hammer and Disconnector (65) List: $77.95 (Save $2.00) $75.95 10% Bonus Bucks
Image of Geissele Standard Lower Parts Kit made-in-usa-flag Geissele Standard Lower Parts Kit (24) List: $78.52 (Save 25%) $59.00 Best Rated
Image of KAK AR-15 Carbine Buffer Tube Kit Mil-Spec KAK AR-15 Carbine Buffer Tube Kit Mil-Spec (4) List: $45.00 (Save 39%) $27.50
Image of TRYBE Defense LR-308 DPMS .308 Complete Bolt Carrier Group (BCG) 3 models TRYBE Defense LR-308 DPMS .308 Complete Bolt Carrier Group (BCG) (73) As Low As (Save Up to 50%) $99.99 Up to 12% Coupon
Image of Bravo Company Mil-Spec Carbine Stock Hardware Mounting Kit Bravo Company Mil-Spec Carbine Stock Hardware Mounting Kit (39) List: $65.00 (Save 15%) $54.99 Blazin' Deal
Image of Strike Industries AR Anti-Walk Pins Strike Industries AR Anti-Walk Pins (37) List: $15.95 (Save $1.00) $14.95
Image of Rise Armament OPMOD Hex-C RA-240 AR-15 Enhanced Rifle Trigger and Lower Parts Kit Rise Armament OPMOD Hex-C RA-240 AR-15 Enhanced Rifle Trigger and Lower Parts Kit (31) List: $214.99 (Save 39%) $131.25 Blazin' Deal
Image of TacFire A2 AR-15/5.56 Fixed Stock Kit TacFire A2 AR-15/5.56 Fixed Stock Kit (45) List: $64.99 (Save $6.00) $58.99 Best Rated
Image of Aero Precision Enhanced Carbine Buffer Kit made-in-usa-flag 4 models Aero Precision Enhanced Carbine Buffer Kit (70) As Low As (Save Up to 10%) $76.99 Best Rated
Image of Radian Weapons Talon Ambidextrous 45/90 Safety Selector Combo 2-Lever KIT made-in-usa-flag 2 models Radian Weapons Talon Ambidextrous 45/90 Safety Selector Combo 2-Lever KIT (38) List: $77.99 (Save Up to 15%) $69.95 Best Rated
Image of Armaspec AR15 Gen4 C/H/H2 Stealth Recoil Spring Kit made-in-usa-flag Armaspec AR15 Gen4 C/H/H2 Stealth Recoil Spring Kit (17) List: $109.99 (Save 10%) $98.99 Best Rated
Image of Strike Industries AR Picatinny Stock Adapters 3 models Strike Industries AR Picatinny Stock Adapters (24) As Low As (Save Up to 23%) $49.99 Best Rated
Image of Real Avid AR-15 Armorers Master Kit Pro Real Avid AR-15 Armorers Master Kit Pro (9) List: $620.00 (Save 15%) $529.99 Best Rated
Image of Daniel Defense AR-15 Lower Receiver Parts Kit, Semi-Auto Daniel Defense AR-15 Lower Receiver Parts Kit, Semi-Auto (28) List: $127.00 (Save $9.00) $118.00 Best Rated
Image of Aero Precision AR15 Enhanced Carbine Buffer Kit w/Carbine Buffer made-in-usa-flag 2 models Aero Precision AR15 Enhanced Carbine Buffer Kit w/Carbine Buffer (12) List: $85.00 (Save $8.01) $76.99 Best Rated
Image of Maxim Defense Industries MDX 505 PDX SCW PDW Brace Upper Kit made-in-usa-flag 6 models Maxim Defense Industries MDX 505 PDX SCW PDW Brace Upper Kit (7) List: $1,615.50 (Save Up to 19%) $1,453.95 Blazin' Deal
Image of Vltor A5, Spring And Buffer Kit Vltor A5, Spring And Buffer Kit (17) List: $65.95 (Save 11%) $58.99 Best Rated
Image of Armaspec AR15 GEN4 H2 Stealth Recoil Spring Buffer Kit made-in-usa-flag Armaspec AR15 GEN4 H2 Stealth Recoil Spring Buffer Kit (2) List: $120.99 (Save 10%) $108.89
Image of Armaspec AR10 GEN4 H3 Stealth Recoil Spring Buffer Kit made-in-usa-flag Armaspec AR10 GEN4 H3 Stealth Recoil Spring Buffer Kit (13) List: $120.99 (Save 10%) $108.89 Best Rated
Image of FM Products Glock Style 9mm 5 inch AR Rear Charging Builders Kits FM Products Glock Style 9mm 5 inch AR Rear Charging Builders Kits (2) List: $499.00 (Save $30.00) $469.00
Image of ZEV Technologies Z19 Duty Complete Slide w/RMR Cut ZEV Technologies Z19 Duty Complete Slide w/RMR Cut (1) List: $469.00 (Save $9.38) $459.62
Image of Zaffiri Precision Glock 43 ZPS.2 RMSc Cut Complete Upper 2 models Zaffiri Precision Glock 43 ZPS.2 RMSc Cut Complete Upper (3) List: $559.99 (Save 11%) $499.99 Free 2 Day Shipping
Image of Bowden Tactical AR-15 Rifle Build Kit Bowden Tactical AR-15 Rifle Build Kit List: $779.95 (Save $34.00) $745.95
Image of Bravo Company MFG MK2 Recoil Mitigation System - Mod 1 3 models Bravo Company MFG MK2 Recoil Mitigation System - Mod 1 (16) As Low As (Save 15%) $104.19 Blazin' Deal
Image of Timber Creek Enforcer AR Complete Build Kit 11 models Timber Creek Enforcer AR Complete Build Kit (19) As Low As (Save Up to 47%) $400.00 Free 2 Day Shipping
Image of FAB Defense M4 Collapsible Stock Optics-Ready Pro Kit For Ruger 10/22 3 models FAB Defense M4 Collapsible Stock Optics-Ready Pro Kit For Ruger 10/22 (16) As Low As (Save Up to 35%) $153.74 Up to 12% Coupon
Image of RISE Armament OpticsPlanet Exclusive RAVE 140 With AR-15 Lower Parts Kit 2 models RISE Armament OpticsPlanet Exclusive RAVE 140 With AR-15 Lower Parts Kit (43) List: $178.99 (Save 30%) $125.00 Blazin' Deal
Image of Hogue AR15/M16 Kit, Beavertail Grip and OverMold Collapsible Buttstock made-in-usa-flag 8 models Hogue AR15/M16 Kit, Beavertail Grip and OverMold Collapsible Buttstock (389) As Low As (Save 15%) $59.46 Best Rated
Image of CMMG AR-15 ZEROED Gunbuilder's Lower Parts Kit CMMG AR-15 ZEROED Gunbuilder's Lower Parts Kit (19) List: $89.95 $89.29 Best Rated
Image of Aero Precision M5 .308 Enhanced Carbine Buffer Kit made-in-usa-flag 3 models Aero Precision M5 .308 Enhanced Carbine Buffer Kit (35) List: $115.00 (Save $10.01) $104.99 Up to 12% Coupon
Image of Radian Weapons Talon Ambidextrous 45/90 Competition Safety Selector 2-Lever KIT made-in-usa-flag Radian Weapons Talon Ambidextrous 45/90 Competition Safety Selector 2-Lever KIT (15) List: $79.97 (Save 13%) $69.95 Best Rated
Image of Bravo Company AR-15 Enhanced Lower Parts Kit 2 models Bravo Company AR-15 Enhanced Lower Parts Kit (67) List: $130.00 (Save 13%) $113.69 Blazin' Deal
Image of TacFire A2 AR-10 .308 Fixed Buttstock Kit TacFire A2 AR-10 .308 Fixed Buttstock Kit (20) List: $64.99 (Save $6.00) $58.99 Best Rated
Image of Matador Arms MAT916 Upper Reciever 3 models Matador Arms MAT916 Upper Reciever (1) $585.00
Image of Armaspec AR15 GEN4 H3 Stealth Recoil Spring Buffer Kit made-in-usa-flag Armaspec AR15 GEN4 H3 Stealth Recoil Spring Buffer Kit (3) List: $120.99 (Save 10%) $108.89
Image of FAB Defense Ruger 10/22 Collapsible Stock Conversion Kit 3 models FAB Defense Ruger 10/22 Collapsible Stock Conversion Kit (39) As Low As (Save Up to 35%) $111.74 Up to 12% Coupon
Image of Cry Havoc Tactical 223 Two Pin QRB Kits 4 models Cry Havoc Tactical 223 Two Pin QRB Kits (7) As Low As (Save Up to $25.01) $489.99 Free 2 Day Shipping
Image of Aero Precision EPC Lower Parts Kit Minus FCG/Grip made-in-usa-flag Aero Precision EPC Lower Parts Kit Minus FCG/Grip (8) List: $55.99 (Save 21%) $43.99 Best Rated
Image of FAB Defense UAS-PRO Ruger 10/22 UAS Precision Stock Conversion Kit 3 models FAB Defense UAS-PRO Ruger 10/22 UAS Precision Stock Conversion Kit (10) List: $245.99 (Save 35%) $160.49 Free 2 Day Shipping
Image of JP Enterprises Complete JPBC Bolt Carrier Group (BCG) 5 models JP Enterprises Complete JPBC Bolt Carrier Group (BCG) (22) As Low As (Save Up to $25.25) $460.75 10% Bonus Bucks
Image of Tippmann Arms M4-22 ELITE .22 Long Rifle, 16in Conversion Upper Receiver Kit Tippmann Arms M4-22 ELITE .22 Long Rifle, 16in Conversion Upper Receiver Kit List: $379.95 (Save $30.00) $349.95
Image of Guntec USA AR .308 Gen 2 Complete Pistol Upper Kit Guntec USA AR .308 Gen 2 Complete Pistol Upper Kit (2) List: $799.00 (Save 29%) $569.99 On Sale
Image of Radian Weapons The Full Auto Talon Ambidextrous Safety Selector 2-Lever KIT made-in-usa-flag Radian Weapons The Full Auto Talon Ambidextrous Safety Selector 2-Lever KIT (3) $99.95
Image of Sons of Liberty Gun Works Full Auto Blaster Guts Sons of Liberty Gun Works Full Auto Blaster Guts (2) List: $180.00 (Save $9.00) $171.00
Image of PR Triggers Pistol Trigger Model G3 PR Triggers Pistol Trigger Model G3 List: $229.99 (Save 13%) $200.00 Free 2 Day Shipping
Image of Strike Industries PDW Stock 2 models Strike Industries PDW Stock (33) List: $274.95 (Save $15.00) $259.95 5% Bonus Bucks
Image of Daniel Defense Buttstock, Pistol Grip & M-LOK Vertical Foregrip Combo 2 models Daniel Defense Buttstock, Pistol Grip & M-LOK Vertical Foregrip Combo (8) List: $152.00 (Save $12.00) $140.00 Best Rated
Image of Aero Precision M4E1 Lower Parts Kit w/Magpul MOE made-in-usa-flag 2 models Aero Precision M4E1 Lower Parts Kit w/Magpul MOE (27) List: $100.00 (Save 10%) $89.99 Best Rated
Image of Kaw Valley Precision AR-10 CAR SS Tungsten Buffer Kaw Valley Precision AR-10 CAR SS Tungsten Buffer (4) List: $59.95 (Save 29%) $42.70 10% Coupon
Image of Ballistic Advantage 5.56x45mm NATO Hanson Cold Hammer Forged Threaded Barrel w/ Lo Pro made-in-usa-flag 4 models Ballistic Advantage 5.56x45mm NATO Hanson Cold Hammer Forged Threaded Barrel w/ Lo Pro (2) As Low As (Save Up to $16.50) $285.00 Free 2 Day Shipping
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