Quoted:
Not trying to rain on your parade, but I see two possible problems here.
1) 20 - 4 = 16. It's a shotgun so unless you've permanently made it 18 w/ the flash suppressor you may have a slight problem...
2) I'd be really careful w/ shotgun slugs in a 45 can. Lots of shotgun slugs have a wad which is separate. Could lead to baffle strikes and / or an obstructed can.
Well i see a detached flash hider, soooo...
Looks like someone didn't do their homework and
should be taking down some pictures now...
(edited for emphasis)
It really is a gray area though, since the lower (the 'firearm') IS technically a rifle... but it shoots shotgun shells...
but i sure as heck wouldn't be testing those waters by posting pictures on the internet...
and it's obviously not a registered SBS, since the lower is for his .458 project so he says...