The USMC M27 IAR offers superior accuracy and reliability compared to the M16A4, with a free-floating barrel contributing to its performance. Common user errors with buffer springs can cause malfunctions, and the firing pin spring is not critical for function. While the RMR on the SDO is debated for CQB, the M27's STANAG magazine compatibility is a significant advantage over belt-fed systems, though certain polymer magazines like early PMAGs had compatibility issues.
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