A.R.M.S Bi-Level S.I.R.® System?

[RD62]

Cody,

PM inbound.

-RD62

[Mike91A]

Have two of the older M45 . I have Surefire M900s on them with ARMS double lever mounts. No issues yet .

[SinnFéinM1911]

to complicated. to many better options out there, even not running a rail at all!

[Voodoochild]

Had one and sold it wasn't really impressed with it at all. But hey I am not a professional just an average Joe.

[Prisonmike]

I have a bi level SIR on my m4, I've put it through some trigger time. It hasn't let me down yet. I was able to get co witness on my eotech 552 and aimpoint ml2 with the standard front sight post and #40 LP BUIS.I'm about to use it as my primary weapon in Afghan for my AGNA contract there, we'll see how that goes, the only future problem is that the bottom half is plastic and could face some durability issues in the future. As far as the price,yeah it's high but most people that want it don't worry about the price. Working a 109k a year job makes it easy.

[Sttrongbow]

I had one.... bulky and heavy, but it DID work.

I traded mine for a Daniel defense Omega 7.0 and haven't regretted it in the least.

[m4fun]

I have one on an older M4 upper. No complaints. Like the way the rear BUIS would cowitness with the aimpoints.

That lower saw a lot of full auto/suppressed. Since then have gone the way of the piston on a LWRC.

[Ridge_Runner_5]

The modern alternative is the VLTOR CASV-EL

[Prisonmike]

The Bushmaster custom shop uses the A.R.M.S Bi-Level S.I.R.® System as its primary rail. If mine ever fails, you all will be the first to know.

[Failure2Stop]

The Bushmaster custom shop uses the A.R.M.S Bi-Level S.I.R.® System as its primary rail. If mine ever fails, you all will be the first to know.

What Bushmaster does is irrelevant. They are certainly not known for their superior choice of craftsmanship or materials in anything they do.

Anyway, as far as the SIR goes, it's not that the thing is defiantely going to fall off in the middle of an ambush, but rather that technology has advanced a bit since 1996 and there are better, lighter, stronger, smaller options out on the market.