The M4SD is a legacy product that will no longer be manufactured.
However it did help in developing the M4SDII. The original M4SD was based off of prior design from the Spartan and Spartan II, but incorporated a fast attach mechanism which has since evolved even further on the M4SDII.
The M4SD was made of 4130 and had 17-4 baffles.
The only shared feature the new M4SD II has with the older model is the similar mounting system, but even that has been improved significantly. The outer suppressor body is aesthetically pleasing due to being OD Ground on centers after being fully Tig welded with comprehensive weldments throughout. It has a 316L tube, rear mount, and end cap and has a full 718 Incolnel baffle stack as well as wire EDM'd Fast attach geometry and a wire EDM'd bore. Even though we are a smaller company than the major players in the market this can competes with the best of them. It also gains the ability to be used in conjunction with any of the 4 M4SD muzzle devices as well as a standard A2 birdcage. We HIGHLY recommend that the suppressor only be mounted to muzzle devices that are using shims vs crush washers. It has a fairly liberal bore diameter at .311 at the front cap but A2 FH's have a wide tolerance range.
The M4SDII also reduces sound impulse by 34db which places it amongst the top performers in the industry. We are excited to bring it to market after years of development and are anticipating this as a successful product for years to come.
In short.... yes it is better than the M4SD, and as soon as we can make the web revisions the M4SD will be no more.
We are also coming out with a shorter version of the M4SDII (M4SDK) to compete with some of the new shorter cans. This will be released ~end of Q1 2013.
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