-lapco autospirit 12"
-Polished internals and Pen spring mod
-Good, snugg fit.
-Works the way its ment to.
-Can be hard to take off.
Got a old 98c-new 98c adapter with my barrel for free. Works great, provides a good snugg fit for the barrel. Can be a little tight at times and can be hard to screw off. The o-ring is wearing out really fast on mine, but it seems to stay on fine without an o-ring. No breaks and well made.
If you want to save money and share a barrel, or just need a newer thread like me, get this. It works. Gave it a 9 because it eats o-rings and can be a little to snugg at times.