I've run 400's with and without,and yes you get a few more shots, but I don't think it is worth it.
I got about 100 shots from a regged 400 with a Ben Taylor reg running about 4 fps shot to shot. A standard gun will do a good 60 shots in the sweet spot running at the same shot to shot velocity all within approx 15 fps. That's plenty good enough for Hft.
almost every gun I have owned with an manufacturers reg has at some time leaked.
If you do decide to fit one I'd personally go for a Tench reg.
I can honestly say though that I have never felt that either of my MPR's would have benefited from a reg when shooting HFT comps. Just keep your fill pressure to 160/170 bar maximum and see how you go on.
Last edited by DEAN C.; 16th May 2016 at 08:28 PM.