The Sport III fixes the two things Sport II owners replaced first. It moves from a carbine-length to a mid-length gas system, and it swaps the polymer handguard for a 15 inch free-floated aluminum M-LOK handguard. It also goes back to a 1:8 twist 5R barrel and adds a threaded muzzle. What you lose is [...]
M&P 15 Sport III
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