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Old June 15th, 2019, 06:37 AM #51
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Quote:
Originally Posted by Sirex View Post
So, PSA has 15-22s for 299 shipped. About the cost of a cheap dedicated .22lr upper, and cheaper than an upper tier .22lr dedicated upper, along with a lifetime warranty.

One of the issues I have read about using the CMMG .22lr insert (which I have seriously been considering), is lead building up in the gas port hole, I assume when shooting a pure lead .22 bullet. My question is, shooting the copper jacketed .22lr ammo, would that prevent the lead from scraping off into the gas port?

The other question is barrel twist. I have read some on the internet get good results shooting the Aguila 60gr .22 rounds. I have some, but they arent plated, so it goes back to the gas port getting plugged.
From what I understand, .22 anmo isn't copper jacketed, it's "washed" so it will still scrape.

Since I have the parts laying around, I think I'm going to take a 223 barrel and block the gas port with a steel hose clamp. Conversion kits with 3 mags are under $200. I'll make my own dedicated upper.

When I'm sick of it I can disassemble and use the parts again. I'll clear the gas hole if it's clogged, confirm the barrel is fine and use it for another build.

I'll have to test various ammunition at a distance to make sure the ammunition is right but for plinking, it will be fine.
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Old June 15th, 2019, 07:56 PM #52
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Do realize, that anything you do with the gas block or the outside of the barrel, still leaves the gas port open to filling up with lead bits.
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Old June 15th, 2019, 08:35 PM #53
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Quote:
Originally Posted by Pinecone View Post
Do realize, that anything you do with the gas block or the outside of the barrel, still leaves the gas port open to filling up with lead bits.
Sure...as long as you're not using the gas port does it matter? Of course not.

The hole can be cleared if the barrel is used for something else.
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Old June 16th, 2019, 11:43 AM #54
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If you are going for a dedicated setup, why not a barrel designed for .22 LR? Different twist and no gas port
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Old June 16th, 2019, 12:48 PM #55
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Let's face it. We're better off just going M&P 15-22.

Or I can just put some parts together that I have laying around. The conversion kit is an easy sell if I get sick of it.

I'm not arguing it's the best option...it's just an option I'll use.
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Old June 16th, 2019, 06:19 PM #56
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If I clean the AR after every session with the CMMG 22 conversion, will that suffice? I don't want to screw up the AR but I need to reduce the cost of training and the .22 LR rounds are very nicely priced.
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Old June 16th, 2019, 06:37 PM #57
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Quote:
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If I clean the AR after every session with the CMMG 22 conversion, will that suffice? I don't want to screw up the AR but I need to reduce the cost of training and the .22 LR rounds are very nicely priced.
The issue is build up in the gas hole. Cleaning the barrel wouldn't help that much.
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Old June 16th, 2019, 08:09 PM #58
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I think the recommendation is to fire a few .223/5.56 rounds through a rife after you have fired so many .22 rounds.
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Old June 17th, 2019, 06:54 PM #59
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My preference is a 15-22 or dedicated upper.
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Old June 24th, 2019, 12:01 AM #60
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My Spikes conversion bolt is giving me issues with light strikes. Anyone have any suggestions for a fix?
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