If you're looking for a .224 comp that works, take a good look at the JP Enterprises comp. Thing helps suppress both horizontal and vertical recoil, allowing for very past followup shots. However, you don't EVER want to be standing at the shooters left or right shoulders!!
If your looking for...
If you want a sight with the bayo lug that's easy to mount and standard height, try the YHM front gas block.
I've put them on a couple of different AR's and they are good solid bits of kit.
What he said.
I've used small rifle primers in ALL my pistols using powders from W231 through HS6 and W296 and they've ignited every single load without fail. Been doing this since 2000 or so when 38Super loads where loaded to Oh My God scary levels and a regular normal pistol primer would...