I put his bucking and nub in my VFC avalon. VFC is know to have great buckings and nubs and let me tell you, this LayLax bucking IS CRAZY. Tight grouping at 150 feet (350fps). Seal is amazing. I know the seal is good because I run a amplifier, and it is obvious if there is inconsistencies. Arguably the most cost effective upgrade you could buy for your gun. I put a tracer unit on at night to get a better idea on how far the range is now on my gun, it has effective range of ~220ft (which is very good btw).