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Posted: 9/12/2004 9:42:11 AM EDT
Are there any stability or rigidity considerations concerns when choosing between the ARMS SIR C and M models? Seems the C has less cross section in the area where it transitions from top rail to forward tube because of the slip-ring cutout.

Link Posted: 9/12/2004 9:45:12 AM EDT
The top rail is totally rigid, the bottom rail, the plastic piece, wobbles a bit.
Link Posted: 9/12/2004 11:03:41 AM EDT
mine is solid like a rock. but yeah the lower
section is made of plastic
Link Posted: 9/12/2004 12:04:49 PM EDT
The C and M both mount to the barrel nut via a barrel nut choke. Both should be just as solid and rigid if they are installed properly.

BTW, I've also been told that the military actually favored the C over the M because it didn't require removal of the delta ring assembly.
Link Posted: 9/12/2004 4:06:00 PM EDT
Yeah, I'd also read that the C model was the preferred military model.

And FWIW, I have a SIR Model #45C for sale on the EE (sorry, couldn't resist!).

Link Posted: 9/16/2004 6:01:32 AM EDT
Thanks for the input, guys. Whoa, did not know the bottom piece was plastic. Pulling the bbl is not a big deal for me. I'm sort of leaning toward the 58 MOD which doesn't come in a C. WillMunny, thanks for the plug (!!), I'm sorta leaning towards a slimline model though. Why are you getting rid of yours, and what are you replacing it with?
Link Posted: 9/16/2004 3:40:07 PM EDT

Frankly, I'm just a "geardo", like lots of folks here, and am looking to sell a few extra things to help fund a new project. I've loved my SIR: rock-solid, easy to install, excellent barrel cooling, easy to clean, lots of real estate to mount accessories, and cool-looking

If you change your mind, it's still on the EE--and a steal at $300 bucks (somebody stop me!).

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