L1A1. Without a doubt. shot mine against the Bushmaster DCM today. I am really pleased with this rifle!I bought an L1A1 kit and installed it on an Imbel receiver. I bought a new barrel from Sarco that is actually the L2A1 Australian heavy barrel. Springfield 4x14 scope on an ARMS mount.JP muzzlebrake welded to an L1A1 flash suppressor barrel sleeve. Mercury recoil reducer in the buttstock.Adjustable cheek rest from Brownells. M85 Parker Hale bipod(major rework)Isreali flip up buttpad. (get this.It perfects your cheek plant, but its a lot of work to get it to fit the British rifle)I bought every conceivable benchrest reloading tool and perfected a load for this rifle. H380 @50.0gr w 150FMJBT. I'm getting accuracy of .50 @100 yds and I can hit a white 5 gallon bucket consistantly @700yds. Its really accurate,really loud and really dependable. At 17.5 Lbs. its really cool to shoot at 700 yds because it takes 1.1 seconds to cross that distance, and by that time this sweety will sit back down and I can spot the hit and fire again. I've got $3000 in the rifle, reloading gear and the learning process. I had a Paratrooper barrel and folding stock lower, which is a neat setup, but the PSG1 copy took precedence. The PSG1 can really only be had for the $10,000 that its listed for. Buy at least two kits. One should be the Israeli HB for various parts; another for furniture. The Israeli that I got from Century was really wore out,but it had a brand new barrel on it that I cut down to 18" and milled an AK style muzzle brake into it. The metric inch interchange is not an issue.