I have a few GAPs, including a Crusader in 308 Win. It easily bested all the other students rifles on my last course... until we went beyond 800m. At 1000m she hit the 10x10 twice about two inches apart then missed up, down, left and right about 1-3 inches for the next 20 shots or so lol. The longer barreled rifles hit consistently once they were on.
Build time was 7 months for the Crusader, they are faster then most other builds they do as a result of popularity and a ready supply of parts. Quality is fantastic and they are awesome to deal with. If you call there is a good chance they have something on hand for you.
Word of warning however, if you order a 23 inch barrel, they measure from the bolt face forward so you get what I consider a 20 inch barrel. I was hoping for a bit more barrel and I asked for the adjustable A5 sock and got a fixed. The guy who took my original order left the company shortly after my order so maybe that was the reason.
I have one of their M40's, the barrel is huge and it is incredibly accurate. It has the non-stippled stock which I love for some reason. The Crusader has a 1/3 guarantee, the M40 a 1/2. The M40 is tighter than the Crusader and the Crusader meets its guarantee.
I have a Rock with fluted barrel and an A5 both still undergoing break in. So far they are amazing.
I had a Cooper tactical rifle imported a few years ago, again still in break in. 20 inch heavy fluted barrel in 308 Win. Nice, light stock and crisp 2.5 lb trigger. I have only ever seem one other. Closest thing to a one hole gun I have ever shot at 100m with factory ammo, with thorough cleaning between shots.