My new 9mm AR**UPDATED TO MAKE DECKARD HAPPY**

[P0WERWAGON]

what FCG do you?

are you useing the early long tail bolt hold open or the newer normal .223 bolt hold open

if its the long tail be carefull i broke one and they are HARD to find in canada

i am using a 223 lower kit with a 9mm hammer. hammer just looks lik an M16 hammer thats been chopped up.

the bolt carrier is brand new. i think i will ramp it and see if that helps.

 

[Deckard]

I like the look of this one....

 

[Questar]

For those who are looking to do 9mm builds and conversions...

We usually keep the basic 9mm component parts from Rock River Arms in stock... 9mm hammer, magwell adaptor, 9mm buffer and also the 9mm stock spacer if you using a standard A2 Stock/extension tube.

The Bolt Carrier Groups are not usually in stock but we can order them for you. We also try to keep the complete uppers in stock (7" and 10.5") but that situation is constantly changing as product sells and shipments arrive.

Mark

 

[mebiuspower]

Looks like it's much easier to do a .22 conversion instead, I wonder if they make .22 drum mags???

 

[Sniper1]

...
Triggers

...If you want a match style trigger ( RRA NM, CMC and other aftermarket ) you need to get your bolt ramped ( without a ramped bolt you will lock up the works as soon as the bolt goes forward the first time ....you have to take the upper / lower apart to clear jam )

IMO this is the only way to go. I also use my lowers for 9mm and target shooting so I want a good trigger. A properly ramped bolt works for pretty well all triggers

Problem is you will have to take it to a machine shop since none of the ar builders do this in Canada as a service

Another advantage of the ramped bolt is its much easer on your FCG pins . Take a look at a AR 5.56 bolt . They all have a ramp . Dont know why the 9mm colt style bolts dont . Ramping a 9mm bolt duplicates a m16 style ramp
...

What is this ramping of the "bolt" ? isn't it the "carrier" that should be ramped ? Can someone explain more clearly or post pictures of ramped vs non-ramped "bolts" ?
I also want to build myself a 9mm lower and plug it on an RRA 10.5. But I like so much the CMC supermatch single-stage trigger on my .223 AR ! I want one in my 9mm.

 

[P0WERWAGON]

ramped verses non ramped

machined for a lightning link


who could ramp the bolt for me here in BC?

 

[TRG-42]

Sorry for the confusion. Ramping the carrier makes the trigger recocking more gradual, its suppose to minimize the stress of the pins ( holes from egging out , pins from walking)

Ramping also allows the use of most "non" 9mm hammers

As you can see from pic below of a RRA carrier, a match hammer like the CMC gets caught in the notch as the bolt travels forward. This locks up everything so bad you need to drop both takedown / pivot pin out to free it up. Also you cans see trigger gets cocked after a very short amount of bolt travel

After ramping, the cocking is much more gradual . Notice the ramp is similar to a standard AR ( 223 ) carrier now.

You can feel the difference. With a unramped carrier, as you pull the carrier back, you can feel how quickly the hammer is cocked. With a ramped carrier, you need to pull the charging handle back further before hammer cocks

I use the RRA upper on two lowers. One with a CMC , other with a RRA NM trigger with no problems

Any decent machine shop can do this