benelliwerkes

..........I see one is on the way. However they are easily sourced, a life time supply for $10-20! The coiled roll pins are supposed to be slightly chamfered on the leading edges to assist installation; they can be cleaned up in a few seconds by slow turning the roll pin in a cordless drill with some 100+ grit sand paper.

I have never seen a barrel serial number. On some M1-M2's there are barrel #'s representing the barrel production run series but not matched to the receiver serial number. IF you have them post them up please.

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There are a variety of ways to skin this QD sling-point attachment cat. Here's two I have used.

I'm guessing Dave's Metal Works could directly answer your concerns with a phone call; provide rationale for the content of the instruction manual. Standing by to hear the information.

Use 8-40 torx head screws;

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Law enforcement doesn't have a bigger fan than me, but really. Has anyone ever seen a News item showing the cache of firearms the bad guys got caught with.....including and M4 or Beretta 1301 ?........never happens. Has anyone seen a legitimate after action report citing the M4 / 1301 2-shot magazine upsize capacity be responsible for any criminal activity success ?.......the bad guy missed with the first 5 rounds, but that 6th & 7th round took the good guys out of the fight? Leader board says........criminal Fentanyl 55,000 dead last year; super-sized magazine Benelli M4 / 1301 ?? Zero.

Beretta 1301 Tactical , ATF bullseye. https://www.gunbroker.com/c/article/beretta-1301-tactical-shotgun-922r-explained/

It is a Bellville-style washer; serrated.

Gotta get off your wallet! https://www.gunbroker.com/item/1068350053

This. You choose.

Mine looks like this. They don't "pull apart" it is threaded! You could use the choke wrench on the muzzle end, securing the muzzle brake portion in a protected vise. I would think the best approach would be to secure the muzzle end in a protected vise and use a cross bar thru the muzzle brake apertures to turn the part, less likely to mar the parts that way. Use a good penetrating oil first! e.g. Kano Kroil and let is soak for hours, then apply methods.

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American or European, no manufacturer is going to stray too far from SAAMI specs. The spec length of an unfired, folded crimp, 2 3/4" 12 Gauge shell is 2.405", tolerance of +0/-0.250". The spec length of a roll-crimped shell is 2.450", same tolerance. The spec length of a fired shell is 2.760", +0/-0.100".