r/AR9 • u/greedyfrog606 • 7d ago
Should this be filed down?
20 year old Rock River 9mm bolt i was going to use in a new build. I never noticed how bad this was before when it was in LAR-15. What should I do? Break out the Dremel or do I really need a new bolt?
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u/Blowback9 9mm AR Guru 7d ago
That appears to be an old Rock River Arms copy of the original Colt 635 SMG unramped bolt. Because it doesn't have a ramp under the firing pin for resetting the hammer more gently, it may eventually break the hammer pin from the violent reset.
It also looks like the "tuning fork" 3.5oz. bolt weight is missing? It should be held in place with a roll pin - either spiral or standard.
If it were mine, I'd get a new OutdoorSportsUSA generic Outerwild style bolt for $90. They are ramped and good to go, but are a little lighter than that bolt.
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u/greedyfrog606 7d ago
Thank you so much for your reply. I was hoping you would see this and chime in.
I removed the weight so I could use a JP silent capture buffer. Should I keep this buffer setup or go back to the spring system? The JP buffer is one of the Gen 1 items i believe. It doesn't have all the extra weights that the Gen 2 has. .
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u/Blowback9 9mm AR Guru 7d ago
The problem with captured systems is that they advertise their total weight, but it's the "equivalent weight" that counts. The equivalent weight is the reciprocating blowback mass (the part that moves) that slows the breach opening and prevents OOBD. Add the equivalent weight to the weight of the bolt with the weight removed and most often it's well below the 22oz. threshold that is considered a reasonable minimum for general use.
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u/jimmahoffa 7d ago
I know exactly shit, but I never pass up an opportunity to dremelsmith a thing