Whether building your own AR-15 or purchasing an off the shelf AR-15 you will find they are available in a wide array of calibers. Most calibers only require a few parts to shoot something other than 5.56mm.
7.62x39mm Conversion
- 7.62x39mm Bolt
- Barrel Chambered in 7.62x39mm
- 7.62x39mm Magazine
- 7.62x39mm Firing Pin
- Muzzle Break
5.45x39mm Conversion
- 5.45x39mm Bolt
- 5.45x39mm Barrel
- 5.45x39mm Magazine
.458 Socom
- Requires an upper modification
- Barrel Chambered in .458 SOCOM
- .458 Socom Bolt
- Straight tube gas block
- Muzzle Break
6.8 SPC
- Barrel Chambered in 6.8 SPC
- 6.8 SPC Bolt
- 6.8 SPC Magazine
- Muzzle Break
22LR Conversion
- 22LR Bolt Carrier Group
- 22LR Magazine
9mm Conversion
- 9mm Bolt Carrier
- 9mm Mag Block
- 9mm Buffer
- 9mm Magazine Compatible with Mag Block
- Hammer for some conversion kits
- Barrel Chambered in 9mm
- Muzzle Break
.45 ACP Conversion
- Complete upper Modified for .45 ACP
- Mag Block for .45 ACP Conversion
- Compatible magazines for mag block
- Barrel Chambered in 300 Blackout
- Muzzle break (5/8-24 TPI)
- Complete Upper for 50 Beowulf
- Magazine for 50 Beowulf
- 6.5 Grendel bolt
- Barrel chambered in 6.5 Grendel
- Magazine for 6.5 Grendel
- Muzzle Break for 6.5 Grendel