Originally Posted by 11B3OJ3
What is the benefit of a full auto/M16 BCG on a semi auto AR15?
The main reason is the M16 BCGs tend to be truly milspec which often isn't true of the AR-15 or modified AR-15 versions. You might as well get one that's built right. Here's what BCM says about their BCG. Try to get that kind of information out of the comspec AR makers.
BCM Bolt Carrier Group Features
Milspec Carpenter No. 158® steel
HPT Bolt (High Pressure Tested/ Proof)
MPI Bolt (Magnetic Particle Inspected)
Shot Peened Bolt
Chrome Lined Carrier (M16/AUTO)
Chrome Lined Gas Key
Gas Key Hardened to USGI Specifications
Grade 8 Hardened Fasteners
Key Staked Per Mil-Spec
Tool Steel Extractor
BCM Extractor Spring
Black Extractor Insert
Mil-Spec Crane O-Ring (optional)http://www.bravocompanyusa.com/BCM-Bolt-Carrier-Group-MPI-Auto-M16-p/bcm%20bolt%20carrier%20group%20auto%20mp.htm
The biggest issue with assembling an AR isn't so much getting the parts together right - it's getting the right parts together. You'll remember the quality of a gun long after you forget how much you paid for it.
US Army 1966-69, VFW Life Member, Retired Geek