My PTR .308 pistol that served as the host for my HK auto sear - dubbed the Thunderstick by the range officers - finally gave up the ghost after many, many full-auto mag dumps through its 12+ inch barrel. The receiver split open from mag well to ejection port. I briefly considered having it welded, but decided that after all those rounds a new pistol was in order. I went with another PTR .308, this time with an eight-inch barrel. The Thunderstick II again has a Surefire brake, but instead of an HK stock, I installed a Magpul PRS adjustable stock. The big change is on the inside, where to contend with the considerable recoil and internal parts wear I added a polymer buffer. The original buffer still had to be in place to attach the Magpul stock, so a little Dremeling and some longer screws were necessary to make both buffers fit and coexist. But it was well worth the effort for both recoil management and the long-term health of the weapon. The result is the Thunderstick II, and I am lovin' it. And it hasn't split open even once.
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