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Posted: 12/11/2012 1:13:15 PM EDT
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I am building a dedicated 22LR:
I picked up a great deal on a 16" stripped barrel; my question is that since a dedicated 22LR doesn't require the gas block/gas tube part of the system to operate, do I need to do anything with the exposed gas port in the barrel? Right now my plan is to just put a rifle length Hogue aluminum FF tube over it and leave good enough alone; but is there something I am not thinking about with this gas port sitting on top of the barrel there? Should I plug it with something? Cap it somehow, or just let it alone? Thanks. |
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Makes sense.
I wonder if there is an operational or safety issue with leaving the hole as is on the barrel. IE, it will still be "covered" by the rifle length, completely encased Hogue FF tube. I don't see particles being an issue flying up out of the barrel as it doesn't seem to be an issue when there is a gas block and tube there. I may just have to try it out first with nothing and go from there. Thanks for your input and reply. Quoted:
I would cover it with a gas block, misaligned or plug the gas tube hole (in gas block) with a solid pin. That's how CMMG does their gas blocks IIRC. Left uncovered you will still get gas out the port. |
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Quoted:
I will be shooting lead particles everywhere until it leads up itself. This is 22 we are talking about... lead city. Why doesn't 22 choke out a "normal" gas port and tube then? I've shot several thousand through a non dedicated AR with no issues or signs of gas system getting clogged up with lead particles or copper jacket shavings. Not doubting you, but not convinced on lead clogging up the gas port or ejecting out of the barrel other than through the muzzle. Most definately not a call out reply, but any proof of this happening through pictures or personal experience? I am trying to make an informed decision before acting on my build. Thanks for your input. |
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Honestly, I would hang on to the barrel you bought to use with a 5.56 and get a dedicated .22 barrel. Here's why: First, the twist on the barrel you bought is most likely 1:7 or 8 or 9". That's not the best for .22. Second: You'll be using one of those chamber adapters which has a fair amount of free-bore before the projectile grabs the rifling. Third: The dedicated .22 barrels don't have a gas port so you don't have to worry about it.
I think I paid like $99.00 for my dedicated .22 barrel with M4 profile. The twist is 1:16", there's no gas port and because of the design, it sits further back in my upper which makes the barrel look like its 14.5" when it's actually 16". You just need to get the right collar. |
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Quoted: Honestly, I would hang on to the barrel you bought to use with a 5.56 and get a dedicated .22 barrel. Here's why: First, the twist on the barrel you bought is most likely 1:7 or 8 or 9". That's not the best for .22. Second: You'll be using one of those chamber adapters which has a fair amount of free-bore before the projectile grabs the rifling. Third: The dedicated .22 barrels don't have a gas port so you don't have to worry about it. I think I paid like $99.00 for my dedicated .22 barrel with M4 profile. The twist is 1:16", there's no gas port and because of the design, it sits further back in my upper which makes the barrel look like its 14.5" when it's actually 16". You just need to get the right collar. Link to said barrel? |
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Thanks all for the feedback.
I saw the CMMG dedicated barrel with 1/16 twist for $99, a great deal no doubt, but I was able to score a 5.56 barrel for less actually. Also keeping me back is the most dedicated 22LR barrels have the chamber adapter already installed on the barrel, I have an older (I think 2nd generation) CMMG conversion bolt that has the chamber adapter built into the conversion bolt so I don't see that fitting with the dedicated barrel. Maybe this is a mission for OldPainless to document for us....does an unplugged gas port spew like a volcano when shooting 22LR or is it less than we all suspect?? |
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I've been thinking of assembling a dedicated 22lr upper. Here's what I've been looking at for the BCG and barrel.
22lr BCG...http://www.cmmginc.com/product_p/22ba6fa.htm ...http://www.brownells.com/rifle-parts/bolt-parts/caliber-conversion-kits/ar-15-22-lr-conversion-kits-prod54549.aspx 22lr barrel...http://www.cmmginc.com/category_s/1841.htm ...http://www.brownells.com/rifle-parts/barrel-parts/rifle-barrels/ar-15-m16-dedicated-22-lr-barrel-prod42099.aspx (No gas port on the barrel) |
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Quoted:
Quoted:
I will be shooting lead particles everywhere until it leads up itself. This is 22 we are talking about... lead city. Why doesn't 22 choke out a "normal" gas port and tube then? I've shot several thousand through a non dedicated AR with no issues or signs of gas system getting clogged up with lead particles or copper jacket shavings. Not doubting you, but not convinced on lead clogging up the gas port or ejecting out of the barrel other than through the muzzle. Most definately not a call out reply, but any proof of this happening through pictures or personal experience? I am trying to make an informed decision before acting on my build. Thanks for your input. http://www.ar15.com/archive/topic.html?b=3&f=118&t=581918 Google search pulled up quite a few results on this. It happens, mostly determined by the frequency of cleaning and such. I would block the hole with even a cheap strap clamp from a hardware store or something myself. If for no other reason than I don't want my barrel covered in lead particles from blowback. Doesn't have to be anything fancy... And it's your choice, just saying what I would do. |
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durabo: thanks for the reply, thats interesting.
I was also thinking about going the route of a hose clamp or something like that over top of a small square of sheet metal; with the rifle length Hogue tube it shouldn't look too bad. Thanks again for your input. |
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Quoted:
Thanks all for the feedback. I saw the CMMG dedicated barrel with 1/16 twist for $99, a great deal no doubt, but I was able to score a 5.56 barrel for less actually. Also keeping me back is the most dedicated 22LR barrels have the chamber adapter already installed on the barrel, I have an older (I think 2nd generation) CMMG conversion bolt that has the chamber adapter built into the conversion bolt so I don't see that fitting with the dedicated barrel. Maybe this is a mission for OldPainless to document for us....does an unplugged gas port spew like a volcano when shooting 22LR or is it less than we all suspect?? I would need to see yours to tell, but the chamber adaptor on most current bolts can be easily taken off and replaced with a collar that has no chamber adaptor. Also, the 22 barrels do not have a chamber adaptor at all. The barrel simply extends into the receiver and is cut to fit inside the collar on the bolt. |
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If it was a dedicated 22LR, chances are good it has a 22LR barrel with no gas port, or the gas port is covered with a gas block.
Let us know, maybe we'll learn about a new style. Quoted:
hmm...I never thought of the gas coming out of the gas port. I don't even think my barrel had a gas port but if it did the gas is free to flow....interesting. I will have to check how mine performs next time I shoot. |
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