http://armsmounts.com/shop/mounts/a-r-m-s-38-ex-swan-sleeve/

I understand that it is a 1/2" riser, but doesn't that put your RDS too high?


Thanks

It's a riser and an extension. Some will find it's just what they needed, but most, probably not.

Back in the day, we didn't have a ton of choices. B-Square made the first one piece mount that I could afford and it was so flimsy it looked like it was about to break in the package. A.R.M.S. made the swan sleeve that incorporated a BUIS and you could use any rings to suit your need. I also used an ARMS #5 riser that was similar but no BUIS.

ARMS also had this aluminum skeleton that weighed almost as much as the gun, it was basically a rail but it attached to the upper's Picatinny rail.

We've come a long ways in 20 years or so.

Biggest factor is here - ARMS made one of the first successful attempts at an integrated BUIS with a solid mounting rail that was capable of taking a ring mount, and capable of taking repeated abuse.

For regular troops, these were what you could get without breaking the bank.

At the time, drop-in quad rail replacements for the stock handguards were not common, and the Knight rail system was not fully fielded with the M-4.

The ARMS BUIS is generally co-witnessed in the center of the Aimpoint window, using the Aimpoint riser with the SWAN mount.

This is old school gear for an M-4, when the rifle was first becoming common in the field.