Installer on mine failed to tighten baffle stack bolt in shroud, I chalk that up to poor quality control. The two main problems are out-of-round shroud tubes that cause muzzle to point in slightly different direction than shroud end cap. Clipping of external moderators is common. Shrouds can be flipped end over end to hopefully be less out-of-round, DonnyFL came out with a $50 adapter that locks muzzle to shroud end, but you give up sound-reducing baffles and air stripper to use. Also, stocks were inadvertently produced with an empty space between stock and action at the location of the single stock bolt. Tightening stock bolt warps action so that magazine won't fit. Warranty offers a plastic spacer but some need to be trimmed to fit or else action "rocks" in the stock. Recent problem came to light when valve spring "self-tightened" (same as Dynamic Air Rife, a sister design, used to do) until valve breaks (see picture.) JTS is good about providing repair/replacement parts, under warranty, but still a
