redbaron8 Posted January 13, 2012 Report Posted January 13, 2012 Hi all, Here's my question. What rear buis options will work with the standard FSB. I am swapping out my carry handle upper for a flat-top upper and wondered if there are compatible rear sights, or do I have to go the new gas block route, with a new front sight as well? If this is not a violation of protocol, I will obviously have a gently used carry handle upper for sale, after the surgery. Thanks, in advance for any and all help from the forum. Red.
Robocop1051 Posted January 13, 2012 Report Posted January 13, 2012 All of them... 99% of the BUIS are designed to line up at the same height as the FSB. All front sights; handguard mounted, gas block mounted, FSB, are all supposed to be at the same height. This way the rear sights can always be the same.The only types of sights I would be weary about, are the ones that state they are "micro" or "low profile". I have a set of Troy Micro BUIS on an AR, and I'm not 100% sure they are the same same height as the original BUIS. I never measured them to confirm or deny this.
redbaron8 Posted January 13, 2012 Author Report Posted January 13, 2012 I realized that I did not specify that I'm dealing with an AR 10 here, not a AR 15, if that makes any difference. Thanks for your reply. Red.
Robocop1051 Posted January 13, 2012 Report Posted January 13, 2012 Nope, no difference... Same sights
98Z5V Posted January 14, 2012 Report Posted January 14, 2012 There's a 0.040" difference in the height of a standard front sight base and the "F" marked front sight base. F marked front sight bases were developed for the shorter M4 Carbine, over the M16A2. The difference in the sight base height on the shorter carbine was necessary due to the change in sight radius.No matter which front sight base you're using, F or standard, you can make up the zero difference with the standard front sight post. Only thing is, it might be sticking up a little further, or sunk a little lower, that what looks normal.You never stated what the configuration is on your particular AR-10.
Robocop1051 Posted January 14, 2012 Report Posted January 14, 2012 It turns me on when you talk like that <laughs>
98Z5V Posted January 14, 2012 Report Posted January 14, 2012 You should see the emails I get from Drew, when I get all technical... :o <lmao>
redbaron8 Posted January 16, 2012 Author Report Posted January 16, 2012 Rifle started as a carry handle (A2) upper that i bought from a friend. I bought the complete lower from Armalite. Shot it for awhile, decided to make it into a flat-top. Bought the stripped lower a month ago on sale. Accumulated needed tools etc, and will make the conversion tonight. 6 position stock, free float tube from Model 1, Armalite flat-top receiver, Armalite complete lower. Gonna glass it, add a BUIS, and use it as a hog rifle. I'll take pics before and after, and try to post them. Red.
Cali_Ed Posted February 7, 2015 Report Posted February 7, 2015 Just the thread it was looking for, took. A search and going through several pages. Thanks guys
AngelDeVille Posted February 7, 2015 Report Posted February 7, 2015 I picked up a few Matech rears for cheap, I really like them.
Robocop1051 Posted February 8, 2015 Report Posted February 8, 2015 You can get the USMC KAC rear sights from ebay for pretty cheap. Guys get discharged and swipe the unaccounted for gear. I've seen them scoopscooped up for $60-$75. They are identical to the 600m KAC rear sight.
FaRKle! Posted February 8, 2015 Report Posted February 8, 2015 You can get the USMC KAC rear sights from ebay for pretty cheap. Guys get discharged and swipe the unaccounted for gear. I've seen them scoopscooped up for $60-$75. They are identical to the 600m KAC rear sight. Advocating buying stolen property? C:-)
98Z5V Posted February 8, 2015 Report Posted February 8, 2015 I picked up a few Matech rears for cheap, I really like them. Don't count on the range marks being accurate on the .308 ARs. They're pretty damn accurate on 5.56, though.
AngelDeVille Posted February 8, 2015 Report Posted February 8, 2015 Don't count on the range marks being accurate on the .308 ARs. They're pretty damn accurate on 5.56, though. Yeah what he said, I'm still building my .308 so no experience there... But with the M4's I have they are dead on.
blue109 Posted February 8, 2015 Report Posted February 8, 2015 You can get the USMC KAC rear sights from ebay for pretty cheap. Guys get discharged and swipe the unaccounted for gear. I've seen them scoopscooped up for $60-$75. They are identical to the 600m KAC rear sight. got mine for $27 each. sure wish I bought a few more.
survivalshop Posted February 8, 2015 Report Posted February 8, 2015 Careful , all this may work for an Amalite AR 10 , but get into DPMS LR 308's & their Upper receiver rail heights my cause some problems with A2 sight towers.
98Z5V Posted February 8, 2015 Report Posted February 8, 2015 The rail should not have contact with the front sight tower, if you're talking about the handguard. As far as rear receiver height, and rear sight mount, you can adjust for that small difference via front sight height adjustment.
Cali_Ed Posted February 8, 2015 Report Posted February 8, 2015 Good thing for me it's for my 556 build
blue109 Posted February 8, 2015 Report Posted February 8, 2015 DPMS low is the same height as standard AR15...so any standard AR front sight lines up perfectly. the DPMS high and ar10 are the ones that require some adjustment.
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