Yes, the Panzer Arms M4 - Tactical Adjustable Telescopic Shotgun Stock Set is adjustable for comb height allowing you to adjust the height of the cheek rest. This will assist you in lining your sight picture with whatever height optic you are using.
There isn’t a button from what I understand. You rotate the stock to one side and slide to the next notch then rotate back. Classic firearms posted a video on YouTube showing how it works
Yes. The Panzer Arms M4 Tactical Adjustable Telescopic Shotgun Stock Set is compatible with the Benelli M4 and its clones.
Yes, this Panzer Arms M4 - Tactical Adjustable Telescopic Shotgun Stock Set is designed to fit Benelli M4 Shotgun clones.
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The pistol grip included with this kit does not have any finger grooves. The specific dimensions for the grip are not provided. I would recommend reaching out to the manufacturer directly for more information.
Most All Benelli m4 have the notched extension, I think some much older versions didn’t, mine came with the fixed stock and swapped right over to the collapsible
Yes, the Panzer Arms M4 - Tactical Adjustable Telescopic Shotgun Stock Set includes 1 pistol grip, 1 pistol grip nut, and 1 buttstock, constructed from polymer.