Mystery Choke Devices

[Researcher]

There was a question over on Shotgunworld about some choke devices from vintage skeet guns.

I looked through the Gun Digests from 1944 to 1959 and 1934, 39 & 41 Stoeger's and didn't see anything like this.

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We know the Winchester Model 12 on the left and the Remington Model 11 on the right have Cutts Compensators, but what is on the Browning A5 in the middle?

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What is on the Remington Sportsman-48 the gent in the middle is holding?

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[Reggie B]

There was a PowerPac choke that I think was similar in design. Weaver also had a choke system. The one pictured looks like a Cutts of a different model?

[Researcher]

My thought was that someone re-engineered the Pachmayr POWer-PAC by making a new body with one slot and machining a bunch of slots in a Pachmayr choke tube.

Pachmayr POWer-PAC 1962 Gun Digest.jpeg

Weaver-Choke 1962 Gun Digest.jpg