Barrel/slide lock-up?

[CZSteve]

Just out of curriousity.

Which is a better way of providing the lock-up between the barrel and slide.

Lugs (ie: C-75, BHP, ?)
-or-
Block (ie: CZ40, Sig, Glock, ?)

And there is the roller lock of the CZ-52 which is probably the strongest.
Seems like the newer designs are using a locking block into the ejection port as opposed to lucking lugs along the top of the barrel.

Any pro or cons with either design?
Strength?
Accuracy?

 

[Walt Sherrill]

With regard to performance, I doubt it makes much difference -- as long as the system allows the barrel to lock to the slide consistently.

With regard to cost of manufacture, I suspect some of newer systems are less costly to make.

What's best? I guess it depends on your intent.

 

[Walt Sherrill]

(Double post.)

 

[JohnKSa]

Well, if you want a big ejection port, then the block method gives it to you.

I suspect it's a little less prone to dirt problems since the lug method could fill up the recesses with dirt leading to a situation where the gun wouldn't lock.

But, the lug method doesn't let as much dirt in since there's not as big an opening in the slide.

I figure that the block method makes manufacturing and fitting a little easier.

I asked an old gunsmith about the differences in lockup between the various brands of pump shotguns (Mossberg, Winchester, Remington). He said something that stuck with me.

"They all work pretty well, and they all have a weak spot or two." I figure that's pretty true of any mechanical device...

 

[Jim K]

One locking system that has a lot of advantages is the rotating barrel. It dates back at least to the Roth-Steyr, and while it has been most recently tried on a POS called the Colt All American 2000, the idea has merit. One example based on the Colt M1911, the Obregon, used that system and eliminated the dropping barrel, along with the locking lugs, the bottom lugs, the link, and the sloppy bushing. Accuracy was reported to be very good.

Another locking system that works for cartridges up to and including the .45 ACP is none, which is what Hi-Point uses. While the weight is excessive for the .45 ACP, the 9mm is not intolerable, and of course, Astra went up to 9mm Largo with no locking system (although the hammer provided a delay by being set up at a mechanical disadvantage).

Jim