Re: Must have options for a AR?
Magpul ASAP sling mount
Ambi-Selector
Ambi-Bolt release like Seekins/Spikes/POF
A real grip
On non-billet lowers, a big trigger guard
An EXO Technology coated bolt carrier/bolt, M16 style for more weight, and a perma-pin vs cotter pin for the firing pin retainer.
Geisele SSA to start with, others available.
Chrome Silicon buffer spring
KNS trigger/hammer pins
Quick release or ez-pull type takedown pins
Lower features:
Someone makes lowers with retaining screws for the springs for the takedown pins. That's a nice touch. I also saw one that retained the selector while changing grips. Also nice. Tension adjustment screw is almost standard at this point.
When it's available, being the first guy with this would drum up business
This is from
http://riflestocks.com/Projects.htm
For BUIS, I am lazy in acquiring them, but I will admit that I always feel like I'm driving a car with bad brakes in a school zone. They should be there, and it's almost appropriate for you to force us to include them. I like the Troy/Diamondback style.