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Posted: 1/24/2016 10:16:21 AM EDT
Long time absence from here but have a real stumper… I have a factory Colt 9mm lower and factory upper. I bought a new "ramped" bolt as I could not find a .170" 9mm hammer. The ramped bolt as far as I understand allows the use of the standard AR hammer. Installed it yesterday and just working the action, the hammer does not reset if I keep my finer on the trigger and I get hammer follow. If I keep my finger off the trigger, the hammer resets… Any ideas on whats happening? Perplexed and frustrated as I just spent $$$ on that new ramped bolt.
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Posted: 1/24/2016 12:06:20 PM EDT
[#1]
Is there such a thing as too much ramping on a bolt? Maybe thats whats going on…?
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Posted: 1/24/2016 12:31:27 PM EDT
[#2]
yes there is such a thing
may also be an issue with your disconnector |
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Posted: 1/24/2016 12:51:41 PM EDT
[#3]
Nvm
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Posted: 1/24/2016 3:00:46 PM EDT
[#4]
I tried it on another lower. Same hammer follow… narrows down the disconnector issue I guess. Must be a bad bolt.
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Posted: 1/24/2016 10:30:45 PM EDT
[#5]
Usually its an issues with the trigger and the hammer. Some hamers dont get pushed down enough by the ramped carrier to reset it. Try a different trigger.
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Posted: 1/24/2016 10:36:05 PM EDT
[#6]
do you have a rounded hammer or a notched hammer?......this can/will happen with a notched hammer and a ramped bolt.....
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Posted: 1/25/2016 9:18:58 PM EDT
[#7]
Quote HistoryQuoted:
do you have a rounded hammer or a notched hammer?......this can/will happen with a notched hammer and a ramped bolt..... [b][/b]I have a standard Colt hammer, .170 hole size and cannot find a dedicated 9mm hammer which is why I went with the ramped bolt. I think the bolt may be "over ramped". The bolt does the same with a different lower so I am pretty confident its the bolt. Thanks for all your help everyone. I'll update the solution. |
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Posted: 1/26/2016 1:58:35 AM EDT
[#8]
the ramp isn't what pushes the hammer back...it just lessens the shock to the hammer pin...the flat part of the bolt is what pushes the hammer down to catch on the disconnector .....can you measure the bolt from the center of the firing pin hole to the flat of the bolt ....the area that rides between the feed lips of the mag.....
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Posted: 1/29/2016 11:32:12 PM EDT
[#10]
Eureka!! This may be the issue. The .170 hammer I have has a FLAT front, not rounded. Its not a "9mm" hammer, but the flat front one.. not rounded like your picture. Now I need to find a rounded one in .170 pin size. Any ideas where to get one?
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Posted: 1/30/2016 12:20:57 AM EDT
[#11]
Quote HistoryQuoted:
Eureka!! This may be the issue. The .170 hammer I have has a FLAT front, not rounded..... Now I need to find a rounded one in .170 pin size. Any ideas where to get one? Get ahold of DPMS,, seems they may have carried a .170 hammer, and Bushmaster (Hartford Horsey)... Got pic of offending hammer ?? Worst case, send me hammer, I have a tool-Die welder friend that could likely fill it in, then profile it.. |
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Posted: 1/31/2016 12:50:23 AM EDT
[#12]
Yes, there is a supplier. I've ordered from them before. I ordered such a hammer myself previously.
I am guessing you want this... Hammer Assy (7A), Semi-Auto, Type I, 0.170 
You may have this... 
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Posted: 2/3/2016 7:04:32 PM EDT
[#13]
Thanks for all the help. I may just order from Specialized Armament. I'll post the results when they happen. I forgot how to do pics but will get reacquainted with the process and post pics. Thanks again everyone.
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Posted: 2/15/2016 3:11:22 PM EDT
[#14]
Quote HistoryQuoted:
Yes, there is a supplier. I've ordered from them before. I ordered such a hammer myself previously. I am guessing you want this... Hammer Assy (7A), Semi-Auto, Type I, 0.170 http://www.specializedarmament.com/images/products/sa21175.jpg You may have this... http://www.specializedarmament.com/images/products/sp63165.jpg This.... I just had the same problem with a Geissele S3G.... the hammer is just that much shorter, that It would not allow the reset to catch while holding the trigger back. My .154 pinned lower was an easy fix with a ALG ACT. So a hammer / trigger like the one RacyCarr has shown should work. |
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Posted: 2/22/2016 6:11:52 PM EDT
[#15]
Hey folks. Problem solved by the rounded hammer. Easy fix but hard on the wallet $$$$$$$. Ouch, $70.00 hammer!
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