Increased dwell time

[Tired Retired]

The TM9-1276 (1953), page 80-81 states (paraphase) that when inspecting shows that a slide needs replacing, use the Type V (7160091 - preferred) or the Type VI (5337151 - useable) until exhausted. The Type VI (7161843) was authorized, but was supposed to be reserved for M2's until the type VI's and V's were exhausted in the supply system. The tech manual itself neither identifies nor talks about the differences which create the increase dwell time.

The dwell time was creased by changing the deminsion on two cuts on a slide - one increased the size of the cam cutout and the other decreased the width of the area the piston strikes. The easiest way to detect it is measure. On the bottom of the slide, measure the distance between the hole where the bottom of the slide stop comes out and the rear of the cam cut-out. The slide without the cut has a distance of about .100". Slides cut to have the increased dwell time have much smaller distance of about .050". As far as the Type V's which do have the cuts, GENERALLY it was the ones with the 7160091 part number stamped on them - BUT - as Brian said, not all Type V's have the cuts.

(Thanks Brian for keeping me honest....)

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