The Hex-2 Buffer Tube is not designed to have QD mounting point for slings. It is recommended to go with an End Plate that accepts a push button swivel.
Yes, the foam pad is included with this SKU.
The Hex-2 Pistol Buffer Tube has the same inside dimensions as a standard carbine receiver extension, which is compatible with that upper receiver. BUT - you will need to verify with Stern Defense on the spring and buffer weight that would be required due to the caliber. Typically, this caliber will require a much heavier buffer weight and/or a certain spring.
The tube does say pistol.
Was not provided with that information recommend reaching out to manufacturer.
This product is intended for use on AR pistols, regardless of caliber.
Tube Diameter is 1.2 inches.
Overall length is 7.4".
Mark H.
This product is intended for use on AR pistols, regardless of caliber.
Mark H.
The weight is 5 oz.