New Member - Question on identifying M4 Bolt vs M2

[Spence1875]

I am new member here guys, so hello to all, I am longtime member on Ar15.com over 20 years as 0352 (My old USMC MOS), and I am Gooseshooter1 on Ebay and Gunbroker.

I have recently come into a lot of Benelli parts, some I already posted on Ebay, but still sorting through most of it.

I have a ton of complete bolts and I am trying to figure out how to ID an M4 bolt vs a M2 Bolt.

I know the link tail in a standard M2 is 5 inches to the retaining pin and it is 5.5 inches on the SBE models.

I also know that the later guns 3" guns use the one-piece link tail vs the "riveted" together ones on early like it seems all SBEs still have??  

So, I would like to know is there an easy way to ID the M4 vs M2 bolt??

Also, I have bolt with a 5.5" SBE length link tail that is the later one-piece style, all the others are the riveted style like on my SBE 2??

Thanks for any information.

BTW I will be posting the stuff here first I think, then maybe go to ebay second.

I have alot of M4 OEM stuff, OEM bolts of all flavors, choke tubes galore, some complete trigger assemblies, two barrels on ebay now, mage tubes, bolts handles yada yada.

 

 

[Spence1875]

Here are some pics comparing one of the older camo SBE long links, vs the odd one piece long links and a standard carrier and link. Also a pic of the complete bolts I have. 

[Steve Rose]

The M4 bolt will NOT contain an inertia spring and will NOT have the slot cut underneath on the bottom right that prevents "ghost loading" of the M2 and SBE2 (most SBE and M1 bolts will not have this slot cut either)

[Spence1875]

Thanks for the info.