Allen screw

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Allen screw

[′al·ən ‚skrü]
(design engineering)
A screw or bolt which has an axial hexagonal socket in its head.
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Batteries will last for approximately 1-1/2 hours left in the on position The V2 is adjustable for windage using an Allen screw on the right side and elevation screws are located beside the on/off pushbutton.
Switching barrels on a 77/22 is straightforward, requiring you to unscrew two Allen screws securing the barrel retaining block, slide the barrel out and slip a new one in.
The Aker uses two flathead allen screws (wrench provided) to adjust holster tension.
All you have to do is loosen -- and then tighten -- two Allen screws to change barrels.
One of the really nice things about the little Ruger 10/22 is that changing barrels is very easy -- simply remove two Allen screws.
The grip frame is also secured to the main frame with Allen screws.