Okay AR15 guys, need some advice. Here’s a little backstory:
My last purchase AR was a Ruger AR556. They do NOT have an F-marked sight base but according to all sources, they ARE F-marked height. They come with a proprietary Ruger flip-up BUIS in the rear that looks like a Magpul rip-off. Sights in perfect, works great, all is good.
Then, I tried to mount a Milspec carry handle on it. The gun shot super high (like a 2 foot at 50 yards) even with front post adjusted all the way up. Oh well, order a taller post, install it, adjust it all the way up (level with the ears on FSB). Gun shoots better but still high (~4” at 50 yards). Think “WTF” remove carry handle, reinstall Ruger flip-up (which must be shorter than Milspec sights), co-witness with Vortex Sparc, all is fine.
Fast forward till now. My newest AR is a Colt 6720, which does not have an F-marked sight base (apparently used barrel assemblies from 6520s which had A2 uppers) and a Magpul brand flip-up BUIS. Everything I read online says it’s no problem, Colt installs taller front posts at the factory to make up for it. I get it out yesterday and shot it for the first time. Windage is perfect, shot really high. I adjust post all the way up (level with the ears again) and yep, still shoots high. Roughly 4”@50 yards just like the Ruger.
I was gonna order a DD A1.5 read sight and a MRO or Aimpoint but now I’m not sure the irons will even work. Any higher on the post and it will be higher than the ears on the FSB. I need a shorter rear sight. Are there any good options? I could shave it and free float it but hate to cut a new rifle.
Am I dumb or unlucky? How can I be the only person noticing this on these rifles? Any suggestions?
My last purchase AR was a Ruger AR556. They do NOT have an F-marked sight base but according to all sources, they ARE F-marked height. They come with a proprietary Ruger flip-up BUIS in the rear that looks like a Magpul rip-off. Sights in perfect, works great, all is good.
Then, I tried to mount a Milspec carry handle on it. The gun shot super high (like a 2 foot at 50 yards) even with front post adjusted all the way up. Oh well, order a taller post, install it, adjust it all the way up (level with the ears on FSB). Gun shoots better but still high (~4” at 50 yards). Think “WTF” remove carry handle, reinstall Ruger flip-up (which must be shorter than Milspec sights), co-witness with Vortex Sparc, all is fine.
Fast forward till now. My newest AR is a Colt 6720, which does not have an F-marked sight base (apparently used barrel assemblies from 6520s which had A2 uppers) and a Magpul brand flip-up BUIS. Everything I read online says it’s no problem, Colt installs taller front posts at the factory to make up for it. I get it out yesterday and shot it for the first time. Windage is perfect, shot really high. I adjust post all the way up (level with the ears again) and yep, still shoots high. Roughly 4”@50 yards just like the Ruger.
I was gonna order a DD A1.5 read sight and a MRO or Aimpoint but now I’m not sure the irons will even work. Any higher on the post and it will be higher than the ears on the FSB. I need a shorter rear sight. Are there any good options? I could shave it and free float it but hate to cut a new rifle.
Am I dumb or unlucky? How can I be the only person noticing this on these rifles? Any suggestions?