...Any idea of the velocity increase? I'm guessing you'd get the biggest bang for your buck (velocity increase) w/ .40 ammo. If you could get the 180 gr .40 to 1100-1200 fps, you're into 10mm territory. While having less ballistic capability than a typical M4 setup, still, this would be viable for 100 yards or less.

 

I have read that with 9mm 115gr fmj the jump is ~300 FPS with a CX4 versus a handgun.

 

I have yet to come across any documented test though.

 

Anyone out there got a chrono they'd be willing to share?

dirtydigz, how's that aftermarket trigger? I hate, HATE, hate the trigger on mine but love everything else.

 

I like it better than stock, much crisper.

 

I had issues with the replacement hammer not functioning properly, but the guy at Sierra Papa bent over backwards to help me find out the problem. I ended up sending my trigger group assembly to them to test. Turns out they made the hammers with not enough clearance in the center channel to allow for "non-straight" trigger bars in the storms. He actually straightened and polished my trigger bar and it's been fine ever since.

 

Since they diagnosed my problem they revised the hammer design they're selling to have a wider center channel and sent me a replacement at no charge. They're a class act.

 

How much did something like that cost? It would be a much needed improvment.

Ive been thinking of using the Storm as the HD rifle of choice, but maybe for my "downstairs" one. upstairs I still like the M4

Ive been thinking of using the Storm as the HD rifle of choice, but maybe for my "downstairs" one. upstairs I still like the M4

 

Holy cow tinyboy, where do you live, Afganistan?

Ive been thinking of using the Storm as the HD rifle of choice, but maybe for my "downstairs" one. upstairs I still like the M4

 

Holy cow tinyboy, where do you live, Afganistan?

I was thinking that in a HD situation, what is difference between downstair or upstair, or what is the difference between in Afganistan or somewhere else in the world as far as choice of weapons.

I was only kidding guys. Besides, more guns for HD the better right?

How much did something like that cost? It would be a much needed improvment.

 

IIRC trigger is $65 + shipping, hammer is $89 + shipping:

 

http://www.sierrapapacx4.com/

How much did something like that cost? It would be a much needed improvment.

 

IIRC trigger is $65 + shipping, hammer is $89 + shipping:

 

http://www.sierrapapacx4.com/

 

You installed it yourself? If so we might have to meet up and let me feel yours out.

You installed it yourself? If so we might have to meet up and let me feel yours out.

 

Yep.

You installed it yourself? If so we might have to meet up and let me feel yours out.

 

Yep.

 

You comin to the shotgun shoot on Sunday?

You installed it yourself? If so we might have to meet up and let me feel yours out.

 

Yep.

 

You comin to the shotgun shoot on Sunday?

 

Nope, got family visiting this weekend.

okay, that trigger job is a must so I'll ask for that for Christmas

Brian Montgomery at SierraPopa has a new stainless steel guide rod and heavy duty buffer. The cost with shipping is $75.50. I am waiting for mine. I also installed the trigger, hammer and spring with no problems. Brian was very helpful and I like the trigger much more now.

How does it feel, and look? If I were to get it it would buy the complete package since the trigger on mine is absolutely crap.

How does it feel, and look? If I were to get it it would buy the complete package since the trigger on mine is absolutely crap.

 

The SierraPapa website has photos. http://www.sierrapapacx4.com/

 

I shot some one else's Storm which was well worn and the feel was similar but mine was a little better. The trigger is lighter with less creep and it has a cleaner break. It is by no means a match trigger but it is way better than the factory. SierraPapa (Brian Montgomery) says the plastic parts can have widely different tolerances which means some triggers are not too bad and others are terrible. Maybe Brian will give NJGF members a discount. Check to see if he will give you a deal if you buy a steel guide rod too.

Just received my guide rod and buffer from sierra papa today, will install them tonight.

 

Y'all can thank me for helping to do R&D on their hammer, I spent a lot of time back and forth with them and swapping out parts on my storm when their first revision of the hammer didn't work.

 

I posted pics of the hammer and trigger a while ago in a WTB thread on the marketplace, but I think it got purged so here's some again:

 

 

Larger images here:

 

http://98.131.127.215/images/cx4/

Just received my guide rod and buffer from sierra papa today, will install them tonight.

 

Y'all can thank me for helping to do R&D on their hammer, I spent a lot of time back and forth with them and swapping out parts on my storm when their first revision of the hammer didn't work.

 

Thank you. I feel your pain. I had a tough time getting the trigger pin into the trigger. Brian made the trigger pin hole smaller than the factory hole for a better fit. After I let him know what a hard time I had, he now checks the holes to be sure they are within specs. It was not as bad as your installation but it was a pain. I filed the corners of one side the pin slightly to give it just a tiny bit of a point. In other words, a bevel to help the pin into the hole.

 

BTW: Just so everyone understands, the problem was caused by Beretta's manufacturing process. Some the trigger bars are not bent properly which caused them to bind in the tighter Sierrapapa hammer. The Beretta hammers have looser tolerances so the improperly bent trigger bars worked with the factory parts. My Sierrapapa parts and most others worked fine.