Driftertank
Member
I got my PTR back when only the MSG version had the top rail, so i put a MFI Picatinny rail on it.
I run an ejection port buffer on mine so my brass wont be destroyed. Originally i modified the port buffer to fit around the rail, but eventually the actual buffer end of the device developed stress cracks and broke off.
My solution was to take the rail off and have a radius relief milled into the bottom side to clear the buffer so it could remain intact. It has worked well ever since.
My point though, is the welded rail won't allow for the use of a port buffer, at least not an unmodified one. If you don't reload or mind scrapping brass, it won't matter though, and i suspect the welded rail may remove any risk of optics shift. I havent SEEN any movement from mine, but the possibility exists with any clamp-on rail.
I run an ejection port buffer on mine so my brass wont be destroyed. Originally i modified the port buffer to fit around the rail, but eventually the actual buffer end of the device developed stress cracks and broke off.
My solution was to take the rail off and have a radius relief milled into the bottom side to clear the buffer so it could remain intact. It has worked well ever since.
My point though, is the welded rail won't allow for the use of a port buffer, at least not an unmodified one. If you don't reload or mind scrapping brass, it won't matter though, and i suspect the welded rail may remove any risk of optics shift. I havent SEEN any movement from mine, but the possibility exists with any clamp-on rail.