My first and only AR15 is a build that I have just completed. Went to shoot the rifle today and it jams every shot and is having a hard time cycling and most importantly ejecting the shells. The shells get pinched by the BCG before they can get fully ejected. I have a 14.5" Noveske N4 barrel with a mid length gas system that came from Noveske already pinned, Spikes tactical Ni-Boron m16 complete BCG, and the Spikes tactical St-t2 buffer assembly kit. Tried a carbine buffer with the same st-t2 kit spring and same result.

Wondering what you guys run for buffers and springs with this barrel length and gas system? Whether the St-t2 is the reason for this jamming, i think that buffer is probably too heavy for that gas set-up. Trying to figure out what I should switch to.

I run H2s in with my couple of Noveske 14.5's. Something's wrong. What ammo are you using?

I run an A5 system with my 14.5" guns. Haven't had any issues

As Hydra-shokz wrote, something is wrong.
Check the key on your bolt carrier; the gas block alignment; and that gas tube is lined up and OK.
It will be one of the three.

I tried using a Spikes T2 buffer and Sprinco blue spring in my 16" NOVESKE midlength and it repeatedly jammed with the shell getting pinched between the bolt face and the inside/front of the charging handle, Ammo was M855. I tried the T2 buffer with the carbine spring and again it jammed up multiple times. Finally I gave up and went back to a standard carbine spring and carbine weight buffer and it functioned 100% again.

This last trip to the range I tried using an "H" buffer with the carbine spring and it cycled everything I fed it including some .223 PMC Bronze which seems pretty low powered. I'm going to stick with this buffer/spring combo.

Start swapping parts that work in other rifles in and out one at a time to isolate variables.

What weight are the buffers? Do you Have a way to measure them? Just googled H2 buffers and they range from 2.8oz to 4.5oz. That can make a huge difference.

As far as the Gun: Took it out this morning with my buddies BCG and had the lighter carbine buffer and st-t2 spring in it. Cycled great. started with basic single shots then sped it up to basically a three shot burst and not one issue. Only shot about 10 rds because it wasnt an ideal location due to a lot of neighbors nearby. It was a brand new Spikes Ni-B BCG and their customer service is great from my experience so I'll get ahold of them tomorrow and try to get that taken care of.

Thanks

Don't forget to check out the ejector spring. It could be weak.

An H2 should have two tungsten and one steel buffers. If it doesn't, it isn't an H2.

Issue of ejection problem has been pinpointed to the BCG and that should be able to be resolved with the exchange of a new one since I had just received this one via UPS last week.

Back to the main question of this post, What buffers and springs are you guys running with a 14.5" Mid length system like the Noveske that I have??

I shoot 5.56. I was using a ST-T2 buffer and Sprinco red buffer spring. It was a good setup and very little felt recoil. I was bored and switched to the Vltor A5 system and it feels like it recoils more.

I have a 14.5 Afghan build running ST2, standard spring and Noveske BCG, runs like a champ.

I run H2's with mil-spec carbine springs in my 14.5" Noveske middy's. This DOES NOT mean you can!!! What I run is irrelevant! Every rifle/upper/barrel/whatever is going to be a little different.

My advice: Stick with a carbine buffer and mil-spec carbine action spring while you break in a new rifle/upper/whatever. Make sure you M16/AR-15/whatever bolt carrier is well lubed regardless of fancy coatings. Use 5.56 powered ammunition.

Once you break your rifle in and you have a little better understanding on what's going on, you can play with different weights/springs/whatever.

K.I.S.S.