9mm AR. Bolt and Trigger?

[ace4059]

I am looking into buying a 9mm upper for my SBR. The "problem" is I have a Geissele SSA trigger on this SBR. First, I was wanting to know if the trigger would work on a 9mm upper. Second, if it will work, will need a ramped or regular 9mm bolt for that trigger?

Thanks
Ryan

[arjohnson]

I am looking into buying a 9mm upper for my SBR. The "problem" is I have a Geissele SSA trigger on this SBR. First, I was wanting to know if the trigger would work on a 9mm upper. Second, if it will work, will need a ramped or regular 9mm bolt for that trigger?

Thanks
Ryan

I beleive you will need a ramped bolt. Not sure if a unramped bolt will work.

[ace4059]

When searching for this answer I found a few questions about if it will work with a Colt 6540. The answer was Bill Geissele did not know if it would or would not work with that gun. I never did see a definite answer if any member tried it and said it did work or not.

Can someone explain what the ramped bolt is for? and why you need it?

[arjohnson]

The ramped bolt will take some stress off the FCG and allow the use of a standard AR hammer. If using a unramped bolt a 9mm hammer is reccommended although a standard unnotched hammer can be used it does add a little more stress to the FCG which can result in breaking the hammer pin.

Basicly a ramped 9mm bolt will have a ramp that is similar to the ramp on a 5.56 BCG. This will allow the use of most all kinds of trigger groups. It will not allow the use of a 9mm dedicated hammer which can only be used with the unramped bolt..

[wahoo95]

Ramped bolt seems to operate a little more smoothly as well.

[kruzan]

Adco Custom Ramped 9mm Bolt Group

http://www.adcofirearms.com/itemdeta...orynumber=2497

I am using it on my 9mm AR and it works well with my AR Gold trigger.

You want to avoid trigger slap.