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Slide stroke questions for the experts

925 Views 1 Reply 2 Participants Last post by  Jim Watson
We know that the stroke of the Commander and Officer length guns is less than the Gub'ment Model and that the shorter stroke affects timing of the rise of the next round, ejection, etc. Longer (time & length) is better for reliability.
Recoil tunnel on CDR/Officer is shorter as well as abuttment face in the frame.
Glock (and some others) have no tunnel per se.
(1)What is the shortest length tunnel that would work while being durable enough to survive the pounding from bottoming out without breaking off the bottom of the slide?
(2)Would the gain in stroke be that benificial to reliability?
(3)Done in conjunction with a slightly longer dust cover (or even full length)to cover the gap, would allow for use of a shock buff without compromising stroke length/timing?
(4)Would machining a Gub'ment abuttment back to CDR spec be worthwhile for increasing either stroke or preserving original stroke along with the use of a buffer?
(5)Could you gain enough on a CDR to get close to original Gub'ment stroke length using a longer dust cover/shorter tunnel?
All of these questions presuppose certain unstated mods to accomodate the changes I mentioned.
All of this may be academic, but I've had a couple ideas for some experiments floating around in my head for a while. George, Chuck, Ned, Larry, anyone else feel free to cogitate and shoot holes in it, add to it, or whatever you feel.
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I am not a gunsmith or expert but I will tell you what my FLG does in that direction. The limiting factor on slide recoil spring tunnel size is that it be long enough to contain the compressed spring so the slide is stopped by the tunnel on the guide rod flange against the abutment. You do not want the slide stopped by the spring "going soild." That has to be with a spring strong enough to take up the recoil and chamber a round.

My FLG greatly values the slide travel of the G.M. 5" So what he does is cut them off to 4.25". This requires:
1. Cut 0.75" off the slide.
2. Recut for the bushing lug (He doesn't like bull barrels.)
3. Shorten the bushing and barrel.
4. Reset front sight.
5. Turn barrel down to .580" (less bushing relief) back to the face of the second locking lug, removing the front locking lug. He does not consider that this reduces lockup strength, and points out how little engagement there is on the usual front lug.
6. Build a skinny recoil spring guide rod and plug with small hole to take a Glock flatwire recoil spring. (He now uses the ISMI flatwire spring in a higher rating.) Clip spring to the maximum number of turns the tunnel will hold without going solid.
He was also putting Glock springs in OACPs before ISMI came out with their package deal. It works there, too. No 300 round spring life limit. I think it would be just the ticket for a Kimber Compact, too.

They shoot well. Mine came about when I took the compensator off a gun which had had the slide shortened to make a IPSC Modified "Box Gun." It worked well so he chopped his own and has done others. An update of the old pre - Combat Commander Bobcat conversion, he calls it the Polecat.

It is way more expensive than a Commander with a relibility package though. I can't say it shoots any better, either, but it is for sure different. The main difference I see is that the cut-off GM ejects its empties in the same general direction as a standard GM while most Commanders and OACPs scatter them all over.
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