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Below are the key parts of the article and citation I was referring to in the other thread. The article itself is worth the read if you're willing to pay for it from AFTE, or become a member. There are quite a few articles on SNS guns, given that their primary readers are crime lab technicians.

"The slide serrations and safety on the third
model are the same as in the second model. A modified
cam with a narrower forward arm and thicker rearward arm
produced by folding the metal piece over on itself replaces the
cam of the first and second models... The
third model cam pivots near the center of the horizontal arm
with the thicker portion of the cam falling rearward of the pivot
point. A new pin affixes the cam to the frame, although the
previous cam pin remains in place and is trimmed flush with
the frame and obscured by the cam. The broached-out recess
on the right side of the slide, present on the first and second
models, is elongated on the third model to accommodate the
thicker cam, as is the channel on the right underside of the

So why all these changes for the sake of one little part on
a firearm? Certain firearms examiners affiliated with the
Illinois State Police have suggested the thickened cam acts
as a counterweight drop safety that prevents the sear from
releasing the firing pin should the firearm be dropped on the
butt. In theory, the added mass of the thickened rear of the
cam would pull the cam's rear downward as the firearm struck
the ground, thus raising the front of the cam and driving the
sear farther into engagement with the firing pin.
The cam
on the first two P-25 models pivots at the rear and can only
rotate downward. The pin at the middle of the cam blocks
any upward rotation. In contrast to the thick cam, the force of
gravity on the thin cam and sear as the falling firearm struck
the ground could pull the cam and sear downward and out of
engagement with the firing pin."

Hickey, G. (2014). The Raven Arms P-25 and MP-25 Cam Drop Safety, AFTE Journal, 46(3), 224-228

I removed the in-text notes, since it isn't possible to see the figures the author was referring to.

234 Posts

That is very cool. What other kind of research was done in regards to SNS?

I will have to see if I can request a copy via Inter Library Loan.
There are thousands of articles on the AFTE website (you have to pay unless you're a member), I pulled quite a few about Ravens and got a pretty in depth explanation of their manufacturing process in the late 70s through the 1980s. Apparently George Jennings was incredibly helpful to law enforcement agencies and even gave them tours and helped them resolve forensic issues regarding causes of certain tool marks on the pistols. It's pretty interesting reading.
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