Gunboards Forums banner

Ridges in Receiver Cover on RPK?

626 Views 2 Replies 2 Participants Last post by  vladimir
I've noticed that some RPK's (AES-10B in this case) have smooth receiver top covers, while others have three ridges running across the cover. What's the significance of these ridges, and are they something to be desired or avoided? TIA!
1 - 1 of 3 Posts
From what I have read, the design of those stamped/pressed ridges plus the three "mini-ribs" on the top (all used to stiffen the sheet metal from flexing) appeared at about the same time as the stamped-and-folded sheet metal receivers, which would not have the same rigidity as a machined receiver.

Raised ridges are common in magazines and are there for stiffening/anti-flex purposes. Raised ridges, folds, and crimps can allow the use of a lighter gage sheet metal to achieve the same strength as a thicker, flat sheet.

Those protrusions have a structural function and I have seen them on various models. When assembled, those top covers add some rigidity to the firearm unit. They are pretty well "fixed" front and rear and the overlapping "lips" on the sides also help. DDR
1 - 1 of 3 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.