Hello Jim,
After much research and test shooting several of the available conversions out there I finally decided upon the ALS [AR-15 lower] conversion. Darren Wardle in Oregon hand builds them in his factory on CNC [Computerized Numerical Control] equipment and test fires each upper for accuracy before shipping. Darren is a world class record holder in the FCSA and his work is first class. His price is very reasonable but the wait is [currently] almost a year. Worth it, in my opinion. – D.C.
Letter Re: .50 BMG Rifles
