Modern Sporter builds Q&A

I got mine to work (kinda).
But it’s still to tight and didn’t discharge right.
The only way it can work is if you remove material from the bottom of the hook on the upper.
 
It's the High Speed National Match I'm having issues with.

8XeICRS.jpg


That doesn’t fit...as you have also found out.
 
So I’m sure it’s been covered in one of the 5 plus threads I’ve been trying to keep up on. Search functions haven’t yielded exact results. Anyway to my question.

I’ve noticed a few of you fine enthusiasts on here have been using Brownells Lightweight BCG and some using Strike Industries enhanced ultimate ejection port cover(plastic). Has anyone had issues with this BCG not properly opening this port cover or other brands of covers?

I’m planning to order the BCG today so wanted to see if any negative results with it here so far.

Also I’m on the second production run with a FA upper and I know they’re changing the port hole size to help with some issues on the SS uppers(smaller port size/standard size).
 
So I’m sure it’s been covered in one of the 5 plus threads I’ve been trying to keep up on. Search functions haven’t yielded exact results. Anyway to my question.

I’ve noticed a few of you fine enthusiasts on here have been using Brownells Lightweight BCG and some using Strike Industries enhanced ultimate ejection port cover(plastic). Has anyone had issues with this BCG not properly opening this port cover or other brands of covers?

I’m planning to order the BCG today so wanted to see if any negative results with it here so far.

Also I’m on the second production run with a FA upper and I know they’re changing the port hole size to help with some issues on the SS uppers(smaller port size/standard size).
If you have a light weight BCG and SS upper it dose not open the ejection port, weather or not this will be an issue on the FA uppers is yet to be determined. Some guys have added material to the ridge on the ejection port to get it to work. However I have found with my rifle if my ejection port is closed and I put a loaded magazine in, it almost always opens the ejection port when I cycled the BCG. Furthermore if I close my ejection port with my rifle loaded and fire it opens the ejection port and cycles properly 100% of the time. Part of what may help this is the fact the ejection port is also used to vent off the hot gas used to cycle the action. If you look at your bolt carrier you will notice the 2 holes on ejection port side, those are vents and direct the same pressurized gas that cycled the BCG at the ejection port opening pushing the door open
 
Also I’m on the second production run with a FA upper and I know they’re changing the port hole size to help with some issues on the SS uppers(smaller port size/standard size).

I am curious as to exactly what issues you speak of? The larger ejection port allows for the use of any cartridge to eject properly, specifically the big bores.
This same port size and geometry is used by quite a few makers and apart from a few internet warriors concerns, in the real world the larger opening is NOT a problem in any way that effects the operation of the rifle.
 
I was planning on buying a Burris rt6 from them, I figured you just have to fill out the proper forms.

The only way to get a scope from brownells is to have it imported by a third party, which is going to cost you $50.

And unless optics Planet recently changed their policy, they won’t ship a scope to Canada.

At least not to me, the couple of times I tryed.

Easy way to find out is to try and buy it,
 
The only way to get a scope from brownells is to have it imported by a third party, which is going to cost you $50.

And unless optics Planet recently changed their policy, they won’t ship a scope to Canada.

At least not to me, the couple of times I tryed.

Easy way to find out is to try and buy it,

Oh okay, thanks for the info.
 
I slide a BCG into the upper without the charging handle, it’s now stuck in the upper. I think it’s that little tab on the top of the BCG that got it stuck. It slides back and forth a half inch but that’s all. It’s just completely stuck. Has this happened to anyone? And how you fix this?
 
I slide a BCG into the upper without the charging handle, it’s now stuck in the upper. I think it’s that little tab on the top of the BCG that got it stuck. It slides back and forth a half inch but that’s all. It’s just completely stuck. Has this happened to anyone? And how you fix this?
I have a feeling your gas tube is stuck in the BCG gas tap. I think pulling it out with force may work, or, mortar it gently onto something like a thick book might help.
 
I have a feeling your gas tube is stuck in the BCG gas tap. I think pulling it out with force may work, or, mortar it gently onto something like a thick book might help.

I think it’s the BCG bolt cam pic that is stuck holding it back. Anyway to get this out? Theirs a small cavity in the upper and it seems to be stuck in their. Can’t really see much. I’m pretty rookie sooooo.
 
I think it’s the BCG bolt cam pic that is stuck holding it back. Anyway to get this out? Theirs a small cavity in the upper and it seems to be stuck in their. Can’t really see much. I’m pretty rookie sooooo.

Does your upper have a barrel on it?
If you dropped it in, and it slid down hard enough the lugs are probably just holding onto the barrel extension and you need to use some more force.
Don’t be afraid to give it a good thumping (mortar it)
 
Last edited:
I think it’s the BCG bolt cam pic that is stuck holding it back. Anyway to get this out? Theirs a small cavity in the upper and it seems to be stuck in their. Can’t really see much. I’m pretty rookie sooooo.

The cam pin gets caught on the upper, there isn't enough room machined for it. My BCG took a chunk out of my upper.
 
Don't think it was bad luck, no one else has posted a working building with a triggertech adaptable.

There's been a couple others that have tried with the TriggerTech adaptable and ran into the first roadblock, which was getting the rear lug on the upper past the fixed rear takedown pin. I'm just pointing out there's another roadblock past that.

Finally got around to filing down the rear adjustment screw housing on my TriggerTech adjustable and with the KNS takedown pin it works 100% no issues getting the upper and lower to mate now. I filed down the adjustment screw housing so it was almost flush with the rest of the trigger body, and I kept the adjustment screw out (no issues there either when firing).

Took it out to the range today as well for the first time. Pleasantly surprised I didn't have any gas block issues or have to make any adjustments to it.

eBdpnEc.jpg
 
The cam pin gets caught on the upper, there isn't enough room machined for it. My BCG took a chunk out of my upper.

That’s not what I wanna hear. How do I get that out? Slid in no problem... don’t slide out for nothing... I don’t wanna have to use a big hammer.

I literally have nothing on the upper, no barrel or anything, just a BCG, first thing I did when I got the upper was slide the bcg in and crap... it’s been screwed ever since.
 
Last edited:
Back
Top Bottom