I'm confused, why does this matter? If you manage to get something into the gas system, undo the plug, slide the piston off and clean?
Don't see what the issue is.
Springfield Armory M1A 22" barrel in SAGE EBR Mod 0 stock
Dan Wesson CCO | S&W Model 58 blued | S&W Model 29 blued
Springfield 1954 M1 Garand | S&W M&P 15 VTAC 2