kitestir Posted October 18, 2016 Share Posted October 18, 2016 (edited) I have 2 czechmates. I decided to have 2 poppel holes angled back put in one to see how it affected muzzle flip and recoil. Here is a video of the CM with poppel holes. here is a video with my other CM with no holes. Put about 70 rounds through it and definitely like it. It has a little less muzzle flip and is not as harsh. It only loses 30-40 fps. Ammo for both was 7.3 gr of Autocomp. Getting 1490 fps with no hole and 1450 with..... Edited October 18, 2016 by kitestir Link to comment Share on other sites More sharing options...
kneelingatlas Posted October 18, 2016 Share Posted October 18, 2016 Very nice! Link to comment Share on other sites More sharing options...
Honkeymcgee Posted October 18, 2016 Share Posted October 18, 2016 Got any pics? I recently did three holes in mine and extended the front comp port down to vent sideways as well. Link to comment Share on other sites More sharing options...
kitestir Posted October 19, 2016 Author Share Posted October 19, 2016 Pictures as requested! The actual holes measure .180 or approx 3/16" Link to comment Share on other sites More sharing options...
thompsoncustom Posted October 19, 2016 Share Posted October 19, 2016 Cool now just add 2 more Link to comment Share on other sites More sharing options...
kneelingatlas Posted October 19, 2016 Share Posted October 19, 2016 4 minutes ago, thompsoncustom said: Cool now just add 2 more I second that! Link to comment Share on other sites More sharing options...
kneelingatlas Posted October 19, 2016 Share Posted October 19, 2016 But first round off the firing pin stop and increase the stroke Link to comment Share on other sites More sharing options...
Honkeymcgee Posted October 19, 2016 Share Posted October 19, 2016 Looks good. Mine were two 5/32 holes in the comp area and then one 3/16 hole right in between the comp and slide. You can check it out in my Czechmate review in the open gun section. Had to open the last one up to fix my hole starting to walk when I started it with a 5/32 haha. Link to comment Share on other sites More sharing options...
thompsoncustom Posted October 19, 2016 Share Posted October 19, 2016 7 hours ago, kneelingatlas said: But first round off the firing pin stop and increase the stroke ahhhh I've been thinking about increasing the stroke on my CZ open gun but just hate to blindly do it as I've never fired a stroked gun before and I'm not sure how much there is to gain. Link to comment Share on other sites More sharing options...
PRanta Posted October 20, 2016 Share Posted October 20, 2016 What is the benefit of increased stroke? I thought as little as possile moving mass and stroke would be the goal. Link to comment Share on other sites More sharing options...
kneelingatlas Posted October 20, 2016 Share Posted October 20, 2016 8 hours ago, PRanta said: What is the benefit of increased stroke? I thought as little as possile moving mass and stroke would be the goal. Stroking the slide does lighten it to some extent, but the real benefit is that the energy of the slide is dissipated over a longer distance of travel, reducing slide speed before it impacts the frame. I have a bone stock TS with which I plan to create some slow motion videos isolating increased stroke, stay tuned Link to comment Share on other sites More sharing options...
PRanta Posted October 20, 2016 Share Posted October 20, 2016 To my understang longer stroke means longer cycle time means more barrel rise. It works like in the table cloth trick: Don't try to do it slowly. Link to comment Share on other sites More sharing options...
thompsoncustom Posted October 20, 2016 Share Posted October 20, 2016 I think a better analogy would be if you were to drop two eggs from the same distance one impacting the floor and the other landing on a pillow with everything else being equal. Of course the one hitting the hard floor breaks where the one landing on the pillow has the impact slowed and spread out over a distance doesnt break. This is extreme of course but the idea is the same i believe your just trying to spread the recoil out over longer distance and reducing the slide impact thus reducing muzzle rise. Link to comment Share on other sites More sharing options...
Garmil Posted October 20, 2016 Share Posted October 20, 2016 Not sure how those apply. I think of it like 2 cars going the same speed both start coasting toward walls. The stroked slide wall is further away the car slows down and hits the wall with less impact than the other. Link to comment Share on other sites More sharing options...
kneelingatlas Posted October 21, 2016 Share Posted October 21, 2016 1 hour ago, Garmil said: Not sure how those apply. I think of it like 2 cars going the same speed both start coasting toward walls. The stroked slide wall is further away the car slows down and hits the wall with less impact than the other. Ah, I like this one! Link to comment Share on other sites More sharing options...
kneelingatlas Posted October 21, 2016 Share Posted October 21, 2016 vs Link to comment Share on other sites More sharing options...
PRanta Posted October 21, 2016 Share Posted October 21, 2016 Barrel rise is about the inertia of mass under momentum laws. You can work on the moving part (slide) or the non-moving part (frame), or both. Low mass high speed short stroke slide gives shortest time frame for the barrel to rise (table cloth trick analogy). Here you can see what happens when the stoke is long: Unfortunately high speed also means high energy and it will be hard for the parts (egg & car suspension analogies). Just pick your goal. Link to comment Share on other sites More sharing options...
DagoRed Posted October 21, 2016 Share Posted October 21, 2016 Sorry guys, read this thread because it's interesting to me, sadly I don't get how holes change the stroke, you haven't changed the length of the slide. Wouldn't springs affect this more than the gas diversion? I'd think comps are for recoil control (I've only had comped rifles). Can someone exolain it a bit more, um, summed down? I get the net effect comparisons, i.e. The car distance to wall. How do holes add that "distance" thanks Red Link to comment Share on other sites More sharing options...
kneelingatlas Posted October 21, 2016 Share Posted October 21, 2016 Sorry for the thread drift Red, drilling holes in the barrel and stroking the slide are two separate mods which compliment each other, but are otherwise unrelated. Link to comment Share on other sites More sharing options...
GhostDog Posted April 21, 2018 Share Posted April 21, 2018 Kitestir and Honkeymcgee, is it possible you (re)post pictures of the compensator with the holes? Looks like a very easy and effectieve mod to me. Link to comment Share on other sites More sharing options...
zzt Posted April 22, 2018 Share Posted April 22, 2018 ka, exactly how would you stroke a TS? Remove material from the back of the spring tunnel? Link to comment Share on other sites More sharing options...
kneelingatlas Posted April 22, 2018 Share Posted April 22, 2018 1 hour ago, zzt said: ka, exactly how would you stroke a TS? Remove material from the back of the spring tunnel? Yes, that's all it takes; much simpler than a 2011. Link to comment Share on other sites More sharing options...
Amra86 Posted April 23, 2018 Share Posted April 23, 2018 9 hours ago, kneelingatlas said: Yes, that's all it takes; much simpler than a 2011. How much material do you remove? Link to comment Share on other sites More sharing options...
kneelingatlas Posted April 23, 2018 Share Posted April 23, 2018 The factory stroke of the Czechmate is 2.000", the factory stroke of a 2011 is 2.115", from what I've been told, Akai strokes his 2011s to 2.315". My custom TS Open is stroked to 2.440", then I run a buffer which takes back 0.140". For reference, the stroke of a standard CZ 75 is 1.875". Link to comment Share on other sites More sharing options...
kneelingatlas Posted June 13, 2018 Share Posted June 13, 2018 On 4/22/2018 at 6:05 PM, kneelingatlas said: The factory stroke of the Czechmate is 2.000", the factory stroke of a 2011 is 2.115", from what I've been told, Akai strokes his 2011s to 2.315". My custom TS Open is stroked to 2.440", then I run a buffer which takes back 0.140". For reference, the stroke of a standard CZ 75 is 1.875". I made a mistake here, I believe a stroked 2011 is 2.415". Factory Tanfoglio stroke is 1.850" BTW. Link to comment Share on other sites More sharing options...
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