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Post by TMan on Nov 5, 2007 10:54:32 GMT -5
I've noticed something rather odd when shooting guns like the Glock that don't have the standard rifling: Using the same ammo and the same cleaning solvent (foam), the standard rifling pistols have a lot more copper fouling. Is this the result of the maching, the design, the material? Has anyone else noticed this?
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Post by 5ontarget on Nov 5, 2007 17:48:32 GMT -5
The polygonal rifling won't foul with copper as quickly as traditional rifling. Some even report slight an increase in muzzle velocity with polygonal rifling. I've read it has to do with the way the rifling and bullet interact (duh), in that the traditional rifling cuts the jacket more.
As a side note, it is not recommended to shoot cast lead bullets in a polygonal barrel. It fouls faster and the pressure can increase too much. (My guess is that the rifling on a polygonal barrel is usually shallower than traditional land and groove rifling, and therefore fills up faster with lead.)
My Cz82's (the only guns I have with polygonal rifling) are easier to clean, even shooting dirty silver bear ammo, than cleaning my kel-tec 3AT with WWB.
side note #2: when I first looked down the barrel of a polygonal barrel, I thought it was shot out, as I could not see any rifling.
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Post by TMan on Nov 5, 2007 19:54:34 GMT -5
I guess it makes sense when you think about it because there aren't any sharp edges like in the regular rifling.
I wasn't aware that the CZ-82 had polygonal rifling. I have a CZ-83 on order from AIM, I assume it has the same rifling? I ordered it because I wanted something else that shoots .32 ACP.
I'm not sure, but I think the Desert Eagle has polygonal rifling too. I remember when I bought 44 Mag ammo for something that I had them open the box because I wanted to make sure that the bullets were copper coated. They were, but not a FMJ.
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Post by 5ontarget on Nov 6, 2007 7:47:04 GMT -5
The CZ83 has traditional rifling.
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Post by TMan on Nov 6, 2007 12:53:36 GMT -5
Shoot - oh well, I have a lot of foam for cleaning out the copper. At least it works better than that other kind of foam. However, in retrospect, if the other foam had worked than I wouldn't have my daughter, and 31 years later I just can't imagine what life would be like without that girl.
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Post by MLB on Nov 6, 2007 14:23:48 GMT -5
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Post by TMan on Nov 7, 2007 20:43:45 GMT -5
5OT, you are my surplus man. You are right of course, looking down the barrel I can see that it has conventional rifling.
The pistol shows a lot of holster wear, but doesn't appear to have ben shot much. The trigger isn't bad (I've been shooting striker-fired - can you tell?), but is way too positive. When I pull the trigger in SA mode, you can really see the hammer moving backwards. Now what did I do with that case of .32 ACP?
It didn't come with a manual, but I found one on the internet. Good thing - think it would have taken me awhile to figure out that it disassembles like a PPK.
Do your 82's have a very positive trigger/hammer too?
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Post by 5ontarget on Nov 8, 2007 10:02:46 GMT -5
Yes, they both have very positive engagements.
With one of them, if I make a very slow deliberate trigger pull, I can actually get it to drop off the SA hook/part of the sear and it then falls onto the DA portion of the sear and I can either continue the pull and discharge a round, or lower the hammer slowly by slowly releasing the trigger. Not really a nice feature of the pistol. The parts don't look that worn, so my guess it is a result of tolerance stacking. This happened with the other one occasionally until I modified the grip panels and trigger bar. (they were rubbing, and the grip panel was forcing the trigger bar upward.)
At one point I had carefully examined the parts diagram and my pistol and figured out how the firing mechanism worked and how I would have to modify it to improve my SA becoming DA. It looked like I was getting in over my head, so I stopped. The fastest way was to alter the disconnector, but it is riveted onto the frame. If it were pinned to the frame, I'd have probably tackled it. For now, I put a little HVAC foil tape on it to build it up, and it seems to work fine for now.
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