Omega Pacific
Jake Keylock Screw Lock

Produced before the collapse of Omega Pacific, the last iteration of this classic HMS overcomes most of the issues with the earlier models. It sports a keylock nose, massive gate opening, the locking sleeve requires fewer than 4 rotations to unlock (the older version took almost 6!).

It is on the heavy side, but generally only 1-2 of HMS carabiners are carried, or used in situations where weight is irrelevant. It's a pleasure to use with a large diameter barstock and a deep, round basket shape. The Petzl Williams offers similar weight and gate opening but with a flatter basket, which is preferred in some applications or by some climbers.

In my experience on ropes courses I've seen the Jake carabiner gate springs wear out at a rate much faster than Black Diamond or Petzl carabiners - often self-ejecting at some point. This example is new and hasn't been subjected to the same level of extended use, so I cannot say if the issue had been resolved.

Interestingly, Royal Robbins comments on offset gates in this 1995 interview with John Martin Meek at the ACC Annual meeting.

See also: Omega Pacific Jake Screw-Lok, Omega Pacific Jake Quik-Lok, and the related REI HMS Screwgate.