New Griffin Enhanced BCG

[alamo5000]

I?d really like to try one of their enhanced BCGs

KAK recently introduced a gas dumping BCG but it looks like it vents straight into the mag well which to me is a complete nonstarter. I have to disassemble and clean the mags I shoot suppressed with already because of how dirty they get, can?t imagine amplifying the gas and carbon on the ammo that?s about to get introduced to the chamber of the rifle

Honestly it's not that bad. Think about it for a minute. The gas and carbon coming from the barrel is the exact same. This is the majority of carbon getting in the mag. The amount of gas coming from the tube is the same. On a traditional system as soon as the gas key gets disengaged that gas and carbon goes in a 360 degree pattern everywhere in the receiver with some escaping from the ejection port.

With this new one the same amount of gas is there. It's just given a longer path to travel before it hits the open air. Looking from the shooter's position the gas goes about 1/4 the distance around the left side of the BCG before it's dumped. Instead of the gas going on the path of least resistance (which is every direction), it's given a longer dedicated path and through a pocket on the left side of the carrier.

IIRC, griffin said there?s a gas dump or gas pocket on the left side? Might be misremembering. Any issues of extra fouling on the inside of the receiver?

Yes there is a pocket and no there is not anything substantial in terms of 'extra' carbon. If there is anything additional it would be like 5% or less and that's just because of the different pathway.

I recently got a PWS long stroke piston setup that?s 11.8?. I was amazed at how much cleaner the brass is suppressed compared to my tuned DI rifles I?d love to throw one in my setup I?m using the thermal on and use it for suppressed hunting especially if the port noise is that much reduced.

I don't think it would work for a piston rifle. Also it works according to the length of the gas system. The longer the gas the more effective it is. For a shorty it's not really effective enough to be worth it.

Also, my 20? comp rifle has right at 5000 rounds through it and while the carrier is going strong, the bolt has seen better days. Just replaced the extractor spring and oring again. Maybe in another thousand or so I?ll swap in a Griffin carrier group

For a longer gas system it's literally amazing. If you get just the carrier you can keep all the rest of the stuff the same if you want to. They had the carriers on sale for like $117 bucks not long ago.

[alamo5000]

On a side note 11b's comment made me start thinking about why this carrier doesn't work so well on short barrels, or rather why it has diminishing returns the shorter you go barrel length wise.

I think it all boils down to pressure. The amount of PSI when the bullet leaves the barrel is vastly different on a 10.5 vs an 18" rifle. I have a chart somewhere that shows the pressure at various lengths and it's definitely a big factor. I think that the pressure (and velocity of gas in the system) overwhelms anything you do on the back end of the rifle when using short barrels.

[TheRifleman]

I picked one up for one of my 11.5's that's running an Abel Biscuit 5.56, H3 buffer, and an FCD ACF. It is eye watering unlike my other 11.5 with just an H2, same Microbest BCG that's in the previous 11.5, with a Grip n Rip DD CH. The can on that one is a B+T SC-5.56 and is a flow through. I suspect that it's the flow through design that makes it not eye stinging.

Plus I am a left handed rifleman so there's also the ejection port side that's doing it too. I do have a Surefire OBC already on order but that is for my 14.7 mid with a Rarebreed FRT three position to smooth the cyclic a bit.

[alamo5000]

I picked one up for one of my 11.5's that's running an Abel Biscuit 5.56, H3 buffer, and an FCD ACF. It is eye watering unlike my other 11.5 with just an H2, same Microbest BCG that's in the previous 11.5, with a Grip n Rip DD CH. The can on that one is a B+T SC-5.56 and is a flow through. I suspect that it's the flow through design that makes it not eye stinging.

Plus I am a left handed rifleman there's also the ejection port side that's doing it oo. I do have a Surefire OBC already on order but that is for my 14.7 mid with a Rarebreed FRT three position to smooth the cyclic a bit.

This BCG is designed to reduce sound at the shooter's ear and it works better the longer the gas system. On shorties it's negligible for the most part in regards to sound. It might reduce it some but nothing like a longer rifle with a rifle gas system.

As far as gas management goes let us know what your results are. It might help some for a lefty but that seems to be outside of the parameters of the original design concept.

Another thing that could potentially help you is the cam pin path is longer than a regular carrier. This ever so slightly delays the bolt opening giving the gas more time to go forward.

If you are getting that much gas though I would think you probably have other things that could be addressed. I am not familiar with that exact supressor but it sounds like you figured it out. A BCG can't fix a high back pressure suppressor though. Yes it might mitigate some of it but it probably won't eliminate the whole thing.

Just test it out and let us know.

[TheRifleman]

Funny you say that, nearly everyone at the FFL that I bought the Abel from, all stood by their words that the Biscuit 5.56 was perfect for an 11.5. Once free from ATF jail, I fired some shots and zeroed it on my Geissele and LMT mutt and thought that this was not going to be fun as I wiped my eyes in a wetted down handkerchief.

Maybe I should just go ahead and buy another flow through for this particular rifle and stick this Abel on the KAC and Noveske mutt. Currently awaiting a cheap YHM Turbo K to get out of jail but this is for my Zastava ZPAP85 with a KNS adjustable gas piston. Think I should put the Abel on the ZPAP and put the Turbo K on this 11.5 instead?

[alamo5000]

Funny you say that, nearly everyone at the FFL that I bought the Abel from, all stood by their words that the Biscuit 5.56 was perfect for an 11.5. Once free from ATF jail, I fired some shots and zeroed it on my Geissele and LMT mutt and thought that this was not going to be fun as I wiped my eyes in a wetted down handkerchief.

Maybe I should just go ahead and buy another flow through for this particular rifle and stick this Abel on the KAC and Noveske mutt. Currently awaiting a cheap YHM Turbo K to get out of jail but this is for my Zastava ZPAP85 with a KNS adjustable gas piston. Think I should put the Abel on the ZPAP and put the Turbo K on this 11.5 instead?

I am not that familiar with the specific suppressor so I can't speak to that, but I did read on their website that it's supposed to be less back pressure. You do have the 5.56 version correct?

It's difficult to diagnose anything just over the Internet, but if you can put up some pictures of the rifle in question.

It is possible that your rifle is still over gassed a bit. How is the ejection pattern? Who made the barrel? Long story short you should try an even heavier buffer weight and see if that helps. The reason being is if the carrier speed is fast it can force everything open before it gets a chance to evacuate 'more forward'.

That plus the increased cam pin path on the new Griffin BCG might help. If you can just delay the opening of the bolt by just a little bit it will probably help. I would say try both at the same time and see what happens.

If you can, weigh your current buffer because as far as I know none of the numbers are specific in weight, but rather a generic category. Start there and go up more than you think you should and see if that helps at all.

[TheRifleman]

I am not that familiar with the specific suppressor so I can't speak to that, but I did read on their website that it's supposed to be less back pressure. You do have the 5.56 version correct?

It's difficult to diagnose anything just over the Internet, but if you can put up some pictures of the rifle in question.

It is possible that your rifle is still over gassed a bit. How is the ejection pattern? Who made the barrel? Long story short you should try an even heavier buffer weight and see if that helps. The reason being is if the carrier speed is fast it can force everything open before it gets a chance to evacuate 'more forward'.

That plus the increased cam pin path on the new Griffin BCG might help. If you can just delay the opening of the bolt by just a little bit it will probably help. I would say try both at the same time and see what happens.

If you can, weigh your current buffer because as far as I know none of the numbers are specific in weight, but rather a generic category. Start there and go up more than you think you should and see if that helps at all.

Yes, it is indeed 5.56 and I know that I mentioned that specifically prior to. Post #33, I already did mention that it's an H3 as well so the buffer weight has been upped as far as possible. Barrel is Geissele.

I wasn't looking for help but all of your questions were answered, I was contributing to the conversation sorry if it looked like I was asking for help when I wasn't. I mentioned my problem solving steps that I have done and have continued further to do. I hope this helps.

[alamo5000]

Saw you asking about swapping suppressors so I must have misunderstood. All good. Swapping cans would probably give you the same results that you are getting now.

[TheRifleman]

So how does one upload a picture to show? My advanced editor for replies, will not enable.

[alamo5000]

So how does one upload a picture to show? My advanced editor for replies, will not enable.

Honestly that's out of my wheel house. I tried to upload from a mobile device once and ultimately selecting the "full site" option helped. I don't post a lot of pictures.

[gatordev]

At this point, you're going to need to use a third-party image-hosting site. I use Flickr, but there are other free sites out there.

[TheRifleman]

So the Griffin BCG arrived yesterday. Everything looked good, everything was in spec. I was impressed how not needing any cleaning to remove factory preservatives yet I still did it just in case. Clean as a whistle. Lubed, reassembled, and took the Microbest BCG out and replaced with this one. She functioned fine until she didn't, and was getting stuck in the rear occasionally. I looked over everything, nothing came loose with the extension and my staking and TDP torquing was still perfect, nothing was broken with the catch either, so charged it all the way back and it was where it was supposed to be. I measured this BCG with the Microbest BCG that was in it and they were both the same lengths.So on a hunch, I took the upper off this rifle and put my SBR lower with the Tubbs flat wire and it functioned as it was supposed to. So I promptly ordered one for this lower and will be replacing the one in it with the Tubbs. It still works as it should but I am now not feeling it like it is super dependable for the moment. I fed it mag after mags of dummies to manually charge and eject and all was as it should be. However push it all the way as far as it can go and it stays there unless given a slap on the back of the stock. It's not a free flow can on it despite being advertised as low pressure it's has a slight noticeable back pressure that I am concerned with this getting the carrier stuck at a not so great time to be stuck during.I'll get this sorted. It's what I do.

[alamo5000]

Which version of the carrier did you get?

[alamo5000]

Also you might want to weigh the carrier next to your old one. Mine had a weight difference, and that in turn can impact buffer weight and/or spring selection. At least for me it warranted looking into it some.

[TheRifleman]

I said that I got this and that the problem was already solved right?