AHHHH yeah that is a popular rig around the spendy 'tacti-cool' websites. Quite a few posts on the tacti-cool websites show the various rigs, again not my cup of tea but there seems to be a good niche market for them. The majority I've fondled use a 12" barrel for improved ballistics. Not into the system myself, gas block issues for some, like a bit more barrel and MV, but i'm old school, not into suppressors- fun to play with but soon the benefit seems a bit lacking for the price.
Still the idea of picking off pigs out at 400 yards without them spooking much does seem fun, though one squeal and it's off to the races... I hunt ferals here in OK, have you done much hunting out by you? Freakin fast once they decide it's time to go, thank Gawd for mildot...
eace