[Ubino stock installation, should I use any blue locktite ?]

Use the purple loctite. I've been using it on lots of AR parts including sight screws and what not. It's basically their weakest one but does a great job of keeping screws from backing out. 

[FS: LPC/Surefire H16 M1 Forend Light]

Folks,

Lost my login to my other account, so unfortunately having to start fresh. I have for sale an excellent condition Laser Products Corp/Surefire H16 forend light for the M1 Super 90. It has all the mounting hardware. No scratches on the lens, the forend is near perfect and so is the pressure pad. Asking $250 shipped. Payment via Paypal F&F or you cover fees. Please PM me here. Thanks!