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STI SteelMaster with a Quinn III mount.

Discussion in 'Competition Shooting' started by Japle, Dec 20, 2012.

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  1. Japle

    Japle Member

    Joined:
    Feb 28, 2005
    Messages:
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    My SteelMaster was driving me nuts. One match it would be okay and the next it would jam like mad. The original mount for the C-More sat right on top of the ejection port and often bounced empty cases back into the gun, jamming things up. I was told, “tune the ejector” or “change the recoil spring” or “install an AFTEC extractor ($75)” or “dance around the gun shaking Sioux ceremonial rattles”. I sorta thought a $2800 gun from Dawson Precision ought to work pretty well without the customer doing a bunch of complex or expensive mods.

    I was naïve.

    Fact is, the factory mount gives lots of people trouble. Brian Enos’ website has several threads devoted to SteelMaster jams. This pic will show you why.

    SteelMaster1.jpg

    Unless the gun ejects straight to the right (good luck with that!), cases will hit the mount. That’s bad.

    So, in order to be sure the mount was the problem, I removed it, loaded three 20 rounds mags with a mix of three different 9mm loads using mixed brass and different bullet weights and ran them through the gun as fast as I could yank the trigger. Perfect functioning. Not a bobble.

    I ordered a Quinn III mount, which turns the C-More 90 degrees, installed the scope and mount and went to the range to sight in. The gun now works 100%. There's nothing to get in the way of cases flying out of the gun. The scope looks kinda strange mounted that way, but everything works, it fits my CR Speed holster and comes out just as fast as I could ask for.

    SteelMasterwQuinn3_zpsef795f5b.jpg

    As a bonus, the scope sits lower on the slide and doesn't pick up nearly as much crap coming out of the comp. The lens stays clean much longer than it used to. The mount includes a big “gas pedal” for the left thumb that’s adjustable for any size hand. You have to remove it to get to the scope adjustments, but that’s no big deal.

    SteelMasterwQuinn2_zps2766b834.jpg

    Interestingly enough, the gun puts 115, 124 and 147 gr loads inside the 8 minute dot at 20 yds. All in all, I'm happy with the gun, but not too pleased with the STI/Dawson design and setup.
     
  2. 56hawk

    56hawk Member

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    Mar 29, 2011
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    Interesting. I have three open guns with C-Mores on them. One with the original plastic mount and two with Aluminum mounts like you use to have. Don't remember what brand they are though. Never had any jams like you are describing. I'm running 38 Supercomp so that might make a difference.

    How does that sideways mount effect your sight picture? I haven't shot one yet but it seems like it would block some of your vision. Especially if you are doing right to left transitions on longer range targets.
     
  3. Japle

    Japle Member

    Joined:
    Feb 28, 2005
    Messages:
    913
    The SteelMaster is a 9mm and that might make a difference. It was designed to use 9mm Minor loads like WWB. My gun jammed with WWB. There are guns that work with that mount, but mine isn't one of them.

    The mount doesn't get in the way, visually, at all. I guess if you shot with one eye closed you'd notice it, but with both eyes open, the mount is invisible.
     
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