Ar15 pistol???

Has anyone built and registered a AR pistol

No, but it should not be any harder than building a regular AR. Short barrels are no cheaper than long barrels BTW. I have heard also that because of the short gas tube/block location, good function can be a bit of an issues, and may require tuning with buffer weights and spring tension.
 
No, but it should not be any harder than building a regular AR. Short barrels are no cheaper than long barrels BTW. I have heard also that because of the short gas tube/block location, good function can be a bit of an issues, and may require tuning with buffer weights and spring tension.

Or using pigtail gas tubes.
 
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