Are you talking about spending $300 on a regular 223/5.56 DI upper?? This may make more sense, as you can use it to shoot both 22lr and 223.
On a previous post, you talked about a 1:15 upper. For $100 more you might as well buy a complete M&P15-22 rifle for $400 that is properly configured to shoot 22lr.
No, a dedicated 22lr should not have a gas port. 22lr are Blowback operated, not gas operated/DI.



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