Videos tagged with Receiver Extension Alignment

This comprehensive inspection of multiple Smith & Wesson M&P 15 Sport II rifles reveals a range of manufacturing and assembly issues. The video details checks for bolt lock, magazine release function, magazine well dimensions, selector engagement, forward assist operation, muzzle device alignment, receiver extension alignment, rail screw torque, takedown pin bores, gas block screw torque, barrel extension alignment, buffer spring length and compression, gas port alignment, headspace, trigger pull weight, castle nut torque, and carrier key alignment. Several firearms exhibited problems including sticky magazine releases, tight magazine wells, misaligned muzzle devices, clocked receiver extensions, undertorqued rail screws, loose gas block screws, short buffer springs, and loose castle nuts.