A gunsmith in san angelo texas put this gun together. In my opinion he did a very good job with this gun. I got this gun in trade.
Trigger is adjustable set around 2.5lbs
If i would have built it, i would have gone with 7 or 8 twist to shoot a heavier bullet, for i already have another 223 that shoots lighter bullets. 12 twist is pretty common in most guns around my area, guess thats why he went with it. Not a clue.
Was told between 400-500 rounds through gun, ive only worked up the load for it, and shoots really good. 100yd group 3 rounds using 55gr vmax bullets was almost one hole, will post target monday. Leaving work at this time and dont have internet at home. Hope this answers your questions.