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Posted: 5/28/2005 6:08:34 AM EDT
| I don't know the exact measurements, but there are narrow front sight posts which compensate for the shortened sight radius on a carbine. The post usually provided with a carbine was designed for a rifle sight radius, and thus appears very thick on a carbine. Anyone know how/where to get the thin ones? thanks! GH |
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www.compasslake.com They have narrow ones and will custom make one to your dimensions as well. |
I sell the KNS .034 and .052 front sight posts. I use them on my carbines and M4's. DENNYS GUNS/ GTS,LLC Look under NATIONAL MATCH SIGHTS ON THE LEFT SIDE MENU. DENNY  |
A narrower sight post doesn't always lend itself to precision. If you can't see your front site than you can't hit anything right I went with a smaller front site on my service rifle for CMP matches because I have a smaller rear aperture. Target shooting it is good for. But for combat I would want something I can pick up FAST I stick with the GI issue front site on my A4 here in Iraq and back home on my mid length.
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What you are looking for is the Colt carbine tapered front sight post. M16A2 sight radius = 19.75" M4A1 sight radius = 14.5" Standard FSP = .072" 14.5" / 19.75" = .7342 .7342 * .072" = .0528" = The width a carbine front sight post must be to appear to the shooter to be the same width as an M16A2 FSP. Colt manufactures a carbine version of the FSP which is tapered and .062" wide, not .052". The military uses the rifle FSP on across the board for supply/consistency/confusion-avoidance reasons. So why the .062" instead of .052" width for the carbine front sight? The problem is as you approach .050" the FSP becomes too brittle for combat use, .062" was the smallest Colt was comfortable with. Anything smaller should be considered match sights, including KNS's .034" and .052" wide FSPs. The Colt carbine tapered FSP is available from Specialized Armament and possibly Brownells. |
+1 My SP1 carbine came w/a higher, skinnier tapered front post, which I lived with for many years. Last year I replaced it w/one of the Bushie higher squared off posts. Did it initially so I could use the same adjustment tool on all my ARs, and have the same sight picture. What I ended up with was a sight picture that makes hitting fast a whole lot easier, especially in poor light. 
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You have just confirmed for me what I've been speculating about for the past 2 years; the reason for the F marked sight bases on Colt M4 barrels. I know that prior to the M4, Colt carbine types came with higher posts, and the bases were the same. The SP1 carbine referred to in my earlier note came with a higher post, and all the Israeli carbines I've ever seen had them. So the F marked sight bases are just to make life a little easier for GI armorers. Good to know my old fart brain still can figure things out
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I was talking merely about the sight post width. The F height FSB is another issue & story entirely. |
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