Modify A.R.M.S.#18 ? riser - M14 Forum

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Modify A.R.M.S.#18 ? riser

This is a discussion on Modify A.R.M.S.#18 ? riser within the Gunsmithing forums, part of the M14 M1A Forum category; I had 30% failure to cycle with #18 mount. The brass would hit rear scope ring, then ride the op rod foward to jam between ...


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Old March 2nd, 2017, 09:10 AM   #1
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Lightbulb Modify A.R.M.S.#18 ? riser

I had 30% failure to cycle with #18 mount. The brass would hit rear scope ring, then ride the op rod foward to jam between front scope ring. Sometimes just bounce around and end up half inbetween bolt and chamber.
Put the#63 riser on, and in reduced the failure rate to 1-2%. ARMS tech said to replace Springfield Armory extractor with USGI. Fulton Armory said you can tune by cutting spring coils. But I really needed to replace the mount for a total cure.
I put on my thinking cap because a $200.00 and a $155.00 part could possibly go in the parts bin to be lost forever.
1.Cut the mount with a diomond blade
2.Opened up riser port, and notched right rear to allow moving unit back one
more slot.
3.Put everything back together, and I now have a spare USGI extractor and
spring. (No high dollar spare parts either!)
Hope ya liked it,Hot Brass ,out
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Thanks from chief on one

Last edited by Hot Brass; March 2nd, 2017 at 12:47 PM. Reason: Bad typing
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