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Posted: 1/22/2013 8:29:49 PM EDT
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How many of you use the .22lr charging handle that cmmg makes. Does it make that much difference from a standard charging handle
Thanks for any advice |
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Quoted: 1.) Did you do any special prep, or just schmear a batch into it?I filled the charging handle of my ST-22 with JB Weld. A quick and inexpensive mod that completely eliminates the chance of a case getting stuck in there. 2.) Is there anything you'd have done differently? |
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Quoted:
I filled the charging handle of my ST-22 with JB Weld. A quick and inexpensive mod that completely eliminates the chance of a case getting stuck in there. Could you please post a pic of the ch underside? I'm having trouble understanding how much of it gets filled. Doesn't the spring and guide rod ride in the underside of the CH? |
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Quoted:
are you getting spent casings stuck in that channel? If not then maybe see how it operates before you mess up a charging handle. Yes i am. However its because of slow bolt speed due to a 4" bbl unsupressed. Things just aren't happening fast enough For good ejection. With 36gr ammo its a common problem. It lessens with 40gr, or with suppressor attached. |
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First, I scrubbed the CH clean and then thoroughly degreased it with brake cleaner.
Then I roughed up the bottom of the channel in the CH with a carbide scribe. Next, I covered the hole on the end with a small piece of teflon pipe tape and masking tape over that. I also covered the outside of the CH with old dried up shoe polish as a release agent but I did not slop up the job any and in the end, it was unnecessary. Mixed up the JBW and while it was still runny used a popsicle stick to scoop it up and drizzle it into the handle. I misjudged the amount of JBW I mixed on the light side. So I set a block and inclined the CH hoping that the still slightly liquid JBW would "flow" a little down to the front end. It sort of did that but not much. After it set up (not sticky to the touch), I laid a piece of pipe tape over the compound and pressed a 3/8" Delrin punch into the fill to form a shallow "channel". Any 3/8" rod will work for this with tape as a release. The 3/8" punch was the perfect size and I suspect that JBW won't stick to Delrin anyway. I decided to do a second pour. I wanted to fill another inch or two of the channel and bring the level of the entire fill up a little higher. The JBW flows pretty well and while liquid, is self-leveling. I repeated the forming of the channel with the punch and the new layer pressed right in, filling the channel up more and forming a pronounced concavity. I let the whole thing cure for a day and then removed the tape and wiped off the shoe polish. Looks good, works great. Cheap and easy fix. Do it once and forget about it. Does not interfere with function at all and eliminates the chance of a case getting stuck in the CH, which had happened to me a couple of times. On my ST-22, the action does not appear to intrude up into the channel in the charging handle at all. If it does, the slight depression provided by the shallow trough I created provides relief. After thousands of rounds fired, there is no evidence of rubbing, scraping or contact of any kind. The only thing I would do differently is to stand the CH on end and fill the front end first then lay it down and pour the channel in a separate step. |
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Quoted: Thanks.First, I scrubbed the CH clean and then thoroughly degreased it with brake cleaner. =================================================== The only thing I would do differently is to stand the CH on end and fill the front end first then lay it down and pour the channel in a separate step. I appreciate the write-up. You gave me my W/E project.  |
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Here are some photos showing how I modified my CH:
I used 5-minute epoxy which flows a little better than JB Weld, and is hopefully less likely to flake off: 
First, I degreased with carb cleaner, applied masking tape and modeling clay to control where the epoxy would go, and then mixed up the 5 minute epoxy per instructions: 
Next I poured in the epoxy, then placed the charging handle on top of the bolt assembly so that the epoxy would conform closely - the thickness of the masking tape ensures adequate clearance for the bolt to move freely: 
After allowing plenty of time for the epoxy to cure, I simply removed the masking tape and modeling clay, cleaned up any excess resin with a razor blade: 
The area I filled with resin is adequate to minimize the chance of cases getting hung up - the rear portion of the charging handle remains behind the breech face, thus a case cannot get back there so epoxy in that area is pointless. Note: In the photos you can see where I have Dremeled out some of the charging handle on the top and bottom, and added some RTV sealant, all to reduce/redirect gas blowback. It seems to help. I hope the above is informative 
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Quoted:
How many of you use the .22lr charging handle that cmmg makes. Does it make that much difference from a standard charging handle I use it. The only thing it will help you with is preventing shells from getting stuck in the bolt carrier on ejection failures. Given what a PITA these failures are, it's a problem worth considering. That said, the JB weld trick works fine, too. |
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