AR15 parts in Porter, Indiana at Great Lake Firearms. Barrels, BCGs, handguards, and stocks to complete your build. Shop online today.

MCR DUAL-FEED UPPER PICATINNY 12.5IN DRY FILM

$6,599.99
MCR DUAL-FEED UPPER PICATINNY 12.5IN DRY FILM
Purchase & earn 6,600 points!Add to cart

FightLite MCR DUAL-FEED AR-15 Upper Assembly – Black | 5.56 NATO | 16.25” Quick-Change Barrel | Accepts AR-15 Magazines & M27 Linked Ammo | M-LOK Rail-Interface System | RipBrake Muzzle Compensator

$6,599.99
FightLite MCR DUAL-FEED AR-15 Upper Assembly - Black | 5.56 NATO | 16.25” Quick-Change Barrel | Accepts AR-15 Magazines & M27 Linked Ammo | M-LOK Rail-Interface System | RipBrake Muzzle Compensator
Purchase & earn 6,600 points!Add to cart

MCR DUAL-FEED UPPER PICATINNY DRY FILM

$6,599.99
MCR DUAL-FEED UPPER PICATINNY DRY FILM
Purchase & earn 6,600 points!Add to cart

FightLite MCR DUAL-FEED AR-15 Upper Assembly – Black | 5.56 NATO | 16.25” Quick-Change Barrel | Accepts AR-15 Magazines & M27 Linked Ammo | M-LOK Rail-Interface System

$5,899.99
FightLite MCR DUAL-FEED AR-15 Upper Assembly - Black | 5.56 NATO | 16.25” Quick-Change Barrel | Accepts AR-15 Magazines & M27 Linked Ammo | M-LOK Rail-Interface System
Purchase & earn 5,900 points!Add to cart

FightLite MCR DUAL-FEED AR-15 Upper Assembly – Black | 5.56 NATO | 16.25” Quick-Change Barrel | Accepts AR-15 Magazines & M27 Linked Ammo | 1913 Picatinny Rail-Interface System

$5,899.99
FightLite MCR DUAL-FEED AR-15 Upper Assembly - Black | 5.56 NATO | 16.25” Quick-Change Barrel | Accepts AR-15 Magazines & M27 Linked Ammo | 1913 Picatinny Rail-Interface System
Purchase & earn 5,900 points!Add to cart

MCR BELT-FED UPPER RECEIVER AUTO 16.25” 1913

$5,899.99
MCR BELT-FED UPPER RECEIVER AUTO 16.25'' 1913
Purchase & earn 5,900 points!Add to cart

RADIAN MODEL 1 COMPLETE AR15 – UPPER 223 WYLDE 17.5″ FDE

$2,069.95
RADIAN MODEL 1 COMPLETE AR15 - UPPER 223 WYLDE 17.5" FDE
Purchase & earn 2,070 points!Add to cart

RADIAN MODEL 1 COMPLETE AR15 – UPPER 223 WYLDE 17.5″ BLACK

$2,069.95
RADIAN MODEL 1 COMPLETE AR15 - UPPER 223 WYLDE 17.5" BLACK
Purchase & earn 2,070 points!Add to cart

RADIAN WEAPONS MODEL 1 UPPER 223WYL 16″ GRY

$2,029.95
RADIAN WEAPONS MODEL 1 UPPER 223WYL 16" GRY
Purchase & earn 2,030 points!Add to cart

RADIAN WEAPONS MODEL 1 UPPER 223WYL 16″ BLK

$2,029.95
RADIAN WEAPONS MODEL 1 UPPER 223WYL 16" BLK
Purchase & earn 2,030 points!Add to cart

RADIAN WEAPONS MODEL 1 UPPER 223WYL 14.5″ GRY

$1,994.95
RADIAN WEAPONS MODEL 1 UPPER 223WYL 14.5" GRY
Purchase & earn 1,995 points!Add to cart

RADIAN MODEL 1 COMPLETE AR15 – UPPER 223 WYLDE 14.5 BLACK

$1,994.95
RADIAN MODEL 1 COMPLETE AR15 - UPPER 223 WYLDE 14.5 BLACK
Purchase & earn 1,995 points!Add to cart

RADIAN MODEL 1 COMPLETE AR15 – UPPER 223 WYLDE 14.5 FDE

$1,994.95
RADIAN MODEL 1 COMPLETE AR15 - UPPER 223 WYLDE 14.5 FDE
Purchase & earn 1,995 points!Read more

RADIAN MODEL 1 COMPLETE AR15 – UPPER 223 WYLDE 10.5 FDE

$1,904.95
RADIAN MODEL 1 COMPLETE AR15 - UPPER 223 WYLDE 10.5 FDE
Purchase & earn 1,905 points!Add to cart

RADIAN MODEL 1 COMPLETE AR15 – UPPER 223 WYLDE 10.5 BLACK

$1,904.95
RADIAN MODEL 1 COMPLETE AR15 - UPPER 223 WYLDE 10.5 BLACK
Purchase & earn 1,905 points!Add to cart

MK12 MOD 0 SPR GEN II 5.56MM 18” BBL 1-7 TWIST UPPER FDE

$1,847.00
MK12 MOD 0 SPR GEN II 5.56MM 18'' BBL 1-7 TWIST UPPER FDE
Purchase & earn 1,847 points!Add to cart

MK12 MOD 0 SPR GEN II 5.56MM 18” BBL 1-8 TWIST UPPER FDE

$1,847.00
MK12 MOD 0 SPR GEN II 5.56MM 18'' BBL 1-8 TWIST UPPER FDE
Purchase & earn 1,847 points!Add to cart

RADIAN MODEL 1 COMPLETE – UPPER 300BLK 9″ BLACK

$1,829.95
RADIAN MODEL 1 COMPLETE - UPPER 300BLK 9" BLACK
Purchase & earn 1,830 points!Read more

RADIAN MODEL 1 COMPLETE – UPPER 300BLK 9″ FDE

$1,829.95
RADIAN MODEL 1 COMPLETE - UPPER 300BLK 9" FDE
Purchase & earn 1,830 points!Read more

MK12 MOD 0 SPR GEN II 5.56MM 18” BBL 1-8 TWIST UPPER BLACK

$1,826.00
MK12 MOD 0 SPR GEN II 5.56MM 18'' BBL 1-8 TWIST UPPER BLACK
Purchase & earn 1,826 points!Add to cart

At Great Lake Firearms, our AR15 Parts selection helps builders and armorers in Porter, Indiana finish reliable, accurate rifles. Find barrels, handguards, bolt carrier groups, stocks, and small parts to tune performance. Combine these with AR Lower Parts, AR Upper Parts, or complete AR Lower Parts Kits for a full build. Browse compatible Rifle Magazines and Optics to finish your setup. We stock parts from trusted makers so your rifle runs smoothly at the range or in the field. Shop parts and accessories online today.