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I have 6 comped guns designed to shoot regular (not 9mm major) loads. The comps work very effectively.
Sorry for the lag, simply put it was Thanksgiving and I was off over eating, over imbibing and the usual nonsense.

Have to ask: what pistols, what caliber and what loads?

I haven't shot a 9mm comped 1911, I have shot 45acp and 38 super compenated guns.

Since the local range shoots USPSA matches, I was out to watch a couple because the guy that runs the range wants to pick my brains for some "outlaw" matches he wants to do. When I was out there, a friend of the owner noticed my LWC and had me try his compensated 9mm whopee pistols ("tricked" Glocks). Compensaters were well designed and well built. I tried his first load, conventional 147 load. Didn't notice any significant muzzle rise, and then tried them in my LWC. Not really much more of a rise. So, on this load compensaters were a waste to time. He gave me some handloads (124 IIRC) that were loaded WARM. bingo, significant help with muzzle rise and I did try them in my 5" 9mm to compare.

Since the way compensaters work has been posted (thanks for that one @gaijin), unless you're not using backwards pressure with your weak hand against your strong hand, it might help. I shoot both Weaver and Triangulated depended on the pistol. There is always backwards tension against my strong hand unless I'm shooting strong hand only or weak hand only.
 

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9mms have muzzle flip? ;)

I've made a few comps for 38 Super and 10mm, and I have found that I got the best results using chambers whose depth front to back, doesn't exceed the length of the bearing surface of the bullet being used. That and a slightly thicker septum between the comp's chambers increases the dwell time (my terminology) between chambers, thereby routing more expanding gasses up through the ports in the chambers. But I'm just a hack in a garage, so take all this with a large grain of salt. :D

thanks man, I appreciate the insightful comments on this post. The gunsmith actually scrapped the barrel while machining, so he refunded me. Maybe I dodged a bullet? ha

I have a few pistolas w/ fixed perm comps, and am always looking to experiment. I've read a study on the comparison between a comp barrel and a ported extended barrel. Both were effective in muzzle flip, with the comp being moreso. I've just never had a ported extended barrel so I wanted to compare for myself.

In response to the really helpful obvious comments on 9mm's muzzle flip, yes it has minimal flip compared to 45/38super, I'm always on the search for a flatter and faster follow up shot.

1) you dodged the bullet on wasting money.
2) Compensated 45acp 1911s are basically a waste of time. Understand that in the old/early IPSC days we were shooting ammo that was hotter then you'll find almost anyone using except maybe in a bowling pin match. I've shot compensated pistols from several well known gunsmiths of the day... muzzle rise just isn't that much different with or without a compensator. This coming from the days when anyone that wanted to be competitive in a money match HAD TO GET a compensated 70 series.

Going to run hot 9mm? or 38 super? Great.. get one properly designed and built. Slots in the barrel, holes in the barrel including magnaport won't work as well.
 

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Discussion Starter #24
1) you dodged the bullet on wasting money.
2) Compensated 45acp 1911s are basically a waste of time. Understand that in the old/early IPSC days we were shooting ammo that was hotter then you'll find almost anyone using except maybe in a bowling pin match. I've shot compensated pistols from several well known gunsmiths of the day... muzzle rise just isn't that much different with or without a compensator. This coming from the days when anyone that wanted to be competitive in a money match HAD TO GET a compensated 70 series.

Going to run hot 9mm? or 38 super? Great.. get one properly designed and built. Slots in the barrel, holes in the barrel including magnaport won't work as well.
Yep, not going the extended ported barrel route.
Sticking to my comp barrels, both for 9mm. I'm tuning them now, they have been very effective.
 

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Have to ask: what pistols, what caliber and what loads?
As far as factory guns designed to run minor.

2 - STI Costa Carry Comps
1 - STI Steel Master
1 - STI Stinger
2 - BUL Armory Vipers

Interesting side note, all those guns have factory one piece barrel/comps.

As far as ammo goes I generally shoot 115gr-124gr ammo for practice. For SD I usually carry Underwood +P+ in my comped guns and carbines (yes close to major).

The rest of my comped guns were designed for other calibers or are not factory.
 

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As far as factory guns designed to run minor.

2 - STI Costa Carry Comps
1 - STI Steel Master
1 - STI Stinger
2 - BUL Armory Vipers

Interesting side note, all those guns have factory one piece barrel/comps.

As far as ammo goes I generally shoot 115gr-124gr ammo for practice. For SD I usually carry Underwood +P+ in my comped guns and carbines (yes close to major).

The rest of my comped guns were designed for other calibers or are not factory.
Fascinating, but if it works for you....

I've shot a lot of different 9mm loads and the only one I have an real "muzzle rise" issue with it Winchester rangers in my light weight commander.

9mm in a full sized 1911 with a steel frame are mild to me. But then I have a lot of years competing with very warm 45acp ammo. I shoot 9, because it's easier on my arthritis. I'm still more accurate with full house 45acp.
 

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Fascinating, but if it works for you....

I've shot a lot of different 9mm loads and the only one I have an real "muzzle rise" issue with it Winchester rangers in my light weight commander.

9mm in a full sized 1911 with a steel frame are mild to me. But then I have a lot of years competing with very warm 45acp ammo. I shoot 9, because it's easier on my arthritis. I'm still more accurate with full house 45acp.
For my first attempt at the then new Steel Challenge, Bob and I built me a lightweight pistol in 9mm. Lightened slide, aluminum frame, turned down barrel to .5", titanium comp, yadda, yadda, yadda. It was an interesting technical exercise, and the lightness of the pistol made it very quick to transition from target to target. Someone made the comment that I was shooting Outer Limits almost as fast as Smoke 'n Hope. :)

I think I used that pistol the next year, and then I sold it. Only 9mm 1911 I've ever owned.
 

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For my first attempt at the then new Steel Challenge, Bob and I built me a lightweight pistol in 9mm. Lightened slide, aluminum frame, turned down barrel to .5", titanium comp, yadda, yadda, yadda. It was an interesting technical exercise, and the lightness of the pistol made it very quick to transition from target to target. Someone made the comment that I was shooting Outer Limits almost as fast as Smoke 'n Hope. :)

I think I used that pistol the next year, and then I sold it. Only 9mm 1911 I've ever owned.
Never bothered shooting the SC. I was press ganged into RO'ing. In those days I was far more interested in shooting practical, tactical stuff. It happens when you're shooting with API instructors and to me, far more challenging. I do like the 9s when my arthritis kicks up.
 
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