They probably don't sell 5% as many rifle gassed barrels as they do carbine and midlenth barrels so those 5% of people are not likely to notice when they have to adjust their front sight 1mm lower to get a proper zero. I'm not questioning Randall, as he's probably forgotten more about AR's than I'll ever know.Īn "F" can work for both, but an A2 won't work on carbines so it makes it easier for any manufacturer to just use the "F" height on all the barrels. Mil-Spec taper pins secure the forged front sight base with the sling swivel secured by tubular rivets. As all of the BCM uppers are built for flat top uppers, all have the proper Mil-Spec F marked front sight base to insure the correct height for iron sight zeroing when using military iron sights. Whether you are doing a clone build or just want a solid backup front sight, we can mount it for you. This PSA 16 Upper is Mil-Spec and does NOT include M-16 Bolt Carrier Group and charging handle. Our A2 front sight FSB installation service can be done to any barrel with a.
As a result, owners of rifles and carbines with the flat top receiver configuration can have problems getting a proper 'zero' for elevation with Mil-Spec back up iron sights. Palmetto State Armory 16 Mid-length 5.56 NATO Upper with FDE Handguard and A2 F-Marked Sight Base. Many commercial offerings use M16A2 height front sight bases on all of their barrels regardless of what type of upper it is installed on. Mil-Spec for rifles issued to the troops require taller front sight bases on all flat top AR rifles. When I talked to Aero Precision, I was worried about Alignment issues with a 20 Inch Barrel, they stated to turn the front sight post 4-6 clicks downward when zeroing in for perfect alignment. Works great with a F Marked Front Sight Base. " Mil-Spec F-Marked Forged Front Sight Bases The Aero Precision A2 carry-handle rear-sight is forged from 7075 T6 aluminum. LE9040 RRA LAR-15 LE Mid-Length A4 Select Fire TBD. LE1040M RRA LAR-15 LE Mid-Length A4 / M-LOK TBD. The removable handle and shorter carbine sight radius makes a taller FSB necessary to maintain. The front sight base on the original M16, M16A1 and A2 is shorter than the FSB on flat top ARs.
A2 CARRY HANDLE UPPER F MARKED MIDLENGTH BARREL MANUAL
It's a PSA so if they screwed up I wouldn't be surprised but BCM also says this regarding their rifle length uppers as well: INCLUDES: Detachable A2 Carry Handle, One Magazine, RRA Case, Sling, Manual and Warranty Information. My new/first AR-15 is 'Pinned 'F' Marked Front Sight Base' but I cannot find a clear description of what it means and why it is desirable. Interesting, I have a 20" upper with an "F" marked FSB that zeros just fine at all distances. 16' Barrel length 'Machine Gun Steel' barrel 5.56 Nato Chamber 1 in 7' twist rate Extra-thick chrome-lined bore hammer forged M4 Feed ramps F-Marked Front sight post A2 Flash Hider Sling Loop Mid-length Hand Guards w/ heat shields Forged upper receiver T-Marks A2 barrel profile, with M4 feed ramps.