Sloughfoot, the link you have is great. What is the purpose of the charging handle on the heavy walled upper,
From the site linked in post above:
Are there rounds that you load as a single shot rather than semi auto?
The thicker walls I assume are due to the round being a powder keg by comparison to .223 and the weight and fit are likely to increase accuracy (?).
The thicker walls I assume are due to the round being a powder keg by comparison to .223 and the weight and fit are likely to increase accuracy (?).