http://www.budsgunshop.com/catalog/p...s_id=411537958
Cant build one for this.
I have read a chrome lined barrel is not as accurate.
I have one with a 20" heavy barrel but I would not want to hold it very long.
I have built 3 and no two are even close to being the same. Lots of options for uppers even 5.7x28.
Doug