I just picked up an unramped 9mm bolt and need to send it off to get done.  A year or so ago I had a guy here do it and he did a great job.  However, I cannot find his contact info.  So who are the guys ramping bolts and how much does it cost from each?

Thanks,
Ghilly

M60joe is closest to PA state line being just south of Cleveland..

Adco Firearms is maybe 2hr west in Toledo area.

There been another fella posting he do the cutting, I want to say he post as MGI ??

Mine was cut by a friend of a friend that work machine shop by day..

I run a Hahn dedicated mag block with a 9mm hammer in the lower and a RRA 16" 9mm upper.  I have seen no need for a ramped bolt.  I have approx 3000 rounds through it with only one failure to feed that was caused by human error.

Don

It's not so much an issue of function as long-term wear and tear on the lower and hammer pin
.

Can you expand on that?  It is my understanding that the ramping is necessary when using a 5.56 hammer, not so with a Colt type 9mm hammer.  I may be wrong in that regard, as I have been wrong before plenty of times, but were the original Colt 9mm's BC ramped?

Don

Read this thread

Ramping is not "necessary" when using a DPMS/M16 style round top hammer - a DPMS/M16 style hammer will work just fine with either a non-ramped bolt or a ramped bolt.  The original Colt bolts were not ramped.  Colt has just recently begun ramping their 9mm bolts.

Hammer pin breakage issues can be reduced/resolved by using heavy duty SS pins or KNS non-rotation pins.

Long term wear and tear on the lower is more a by-product of pin rotation that eventually leads to the pin holes becoming enlarged and/or out of round - more prevalent on FA/high round count guns.  One way to reduce/eliminate pin hole wear is to use KNS anti-rotation pins - if the pins can't rotate, well, I think you can figure that the rest...  If you opt to not use anti-rotation pins and you find your pins holes eventually wear, not too worry, there are ways to fix that.  See M60Joe website for details of welding and bushing/bearing options that are available.  Some methods may be cost effective and worthwhile for an "expensive" and "irreplaceable" registered receiver FA gun, but may not be worthwhile for a $79 no brand lower on a SA gun that is easily replaced.

wpeschel,

Thank you ever so much for the thread link.  Reading it was very informative.  I was under the impression that ramping is being done  to improve function in the 9mm AR, which it is in some slight respect in that it reduces impact stress on the hammer and shear force on the hammer pin/hammer pin holes in the lower when using an AR15//16 hammer in a 9mm blowback conversion.  Still, it is being done primarily as a means to increase lower receiver life and reliability (avoiding broken hammer pins in FA lowers, and if I had a registered FA lower I would definitely go the ramp route).  In my case (a 9mm SA), using a 9mm hammer (less mass to move) and I am using KNS non-rotating hammer/trigger pins, ramping the bolt would seem a waste of money.  Shear force that the hammer pin sees is already reduced, in my case, by the use of the lighter 9mm hammer and a heavy Slash Q9 buffer to retard acceleration and overall travel of the bolt.  As M60joe suggests on its web site, ramp the bolt and one may need to add tungsten weight to the bolt to retard bolt acceleration in an FA application.  I guess what I am saying/asking is; is ramping beneficial/worth the cost in a configuration such as I have?  I suspect not.  On the other hand, were I using a full size AR15/M16 hammer and rotating pins it would be, even in my SA configuration.

Again, thanks for posting the thread link.

Don    

No problem.. Glad I could help..

Why does M60Joe's website say that he "does not ramp semi-auto bolts"?  Is bolt ramping unnecessary on a semi-auto rifle?  Thank you.

Colt made some bolts that were for semi's only, I beleive they may have been used in some blue label or early postban guns, they are no longer made that's what he is refering to.

All 9mm bolts today are full-auto bolts and basically the same, Colt, RRA, CMMG, etc. Except for Olympic which has it's own system.