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Posted: 12/30/2005 6:33:28 PM EDT
I've read numerous posts regarding POSSIBLE issues with flip up rear BUIS' (ie. ARMS 40) and the need to go to a taller front sight post on 16" carbines. I contacted ARMS today and spoke with customer service who informed me the ARMS 40 line was standard milspec height and would not cause a problem with the front sight. The person I spoke with did mention a particular maker was known to not always use milspec FSB's and a rifle from that individual maker may pose a problem.

So Arfcom, what say you? ARMS 40 on a RRA 16", good to go?
Link Posted: 12/30/2005 6:47:26 PM EDT
If you have a M4 height front sight base, you should not have a problem. If you have an A2 height front sight base, you will need a slightly higer front sight post. Bushmaster requires the higher post. I have a 16" Bushmaster pre-ban A3 upper with a #38-EX Swan Sleeve on it, which includes the #40 BUIS. Outstanding unit. I use it for mounting my Aimpoint ML2 with a A.R.M.S. Comp II M68 quick release ringmount. I cannot say enough good things about A.R.M.S.
Link Posted: 12/31/2005 8:35:54 PM EDT
Yup, BM was the maker he mentioned.
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