The Jewell trigger does not lock the bolt. If you do decide on a jewell make sure to have Melvin install when he builds the rifle. Jewells have slightly different dimensions than the Timmneys and typically a small amout of metal removal of the cocking piece needs to be done to get everything timmed right.
I have four NULAS and have the Jewell on one, my .308 and well it is superb..but I am pretty picky about keeping it clean. I am very satisfied with the Timmneys though and have all of them set a 2 lbs.
Talk with Melvin re: LOP etc. He will walk you through it.
Lefty C
