I use Tipton Ultra Vise
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I use Tipton Ultra Vise
I use the butt on the floor.
I use the vise blocks made by this company. They have been around for several years.
I like them so much I just bought another .223 lower receiver vise block. They carry a pretty nice assortment of different blocks for both upper and lowers. Priced well too.
https://www.plastixrevolution.net/
I have a vice mounted on a work bench with a synthetic turf covering. Keeps stuff from getting lost and protects parts during assembly/disassembly...
Tipton best vise here. Also good for mounting optics.