Love all my SLR's...
Please, let us know your take on the JP... thanks ahead of time.
Took me awhile to get to it, but I got the JP style that is a 2-piece clamp-on, ie secures with 6 torx's . It set me back about $120.
When I first got it I realized I made a mistake - I wanted a gas block that adjusted from the muzzle end and this actually adjusts from the side. Mock fitting showed me I should be able to get my tool on it through the existing ports on my Aero M5 handguard so I went ahead and installed it...
The hardest part was getting the gas tube pin in there, something is a pain between the pin they supply and the taper of the hole, whatever the case in the I end I found simply securing it down hard to my plastic table w/ a speed clamp worked really well as it dented the table to make a perfect cradle - then I actually used a 2 lb hammer on the punch to drive it home...
The beauty of these gas blocks are the top piece snaps in place on the barrel - when you first get it you may think initially it's the wrong size then you realize a little force and it snaps perfectly onto the barrel and can be moved but there's a good amount of friction there - this is extremely handy getting it aligned right. In the instructions they say use compressed air to verify it's well situated, I tried but felt better about my pencil marks, so ran w/ them. It lined up perfectly w/ the shoulder on my Aero barrel, no issue there either.
On my Aero M5 once completely installed I found it lines up with ports on the handle so that the allen wrench fits into the adjustment screw but the wrench does rub on one spot when turning it - if I cared I could fix this in 20 seconds by making a little divot on one edge of the guard w/ a dremel but it works just fine.
Adjusted at about 16 clicks out I get a really nice 3 o'clock ejection, there are something like 30 clicks of adjustment on this block so basically it's in the center someplace. They tell you in the instructions to start at 6 clicks out but that it is unlikely anything will cycle at a setting of 6. So far so good - provided it holds it's setting and doesn't cause problems I'm sure I'll end up with another one of these.