Anyone ever seen this?

[cmshoot]

If trimmed properly I don't see how they push the BCG up since they sit under the rear take down pin lug. Pushing up against the steel take down pin is a lot of force exerted by a piece of silicone.

The Accu-Wedge pushes up on the rear takedown pin lug of the upper receiver.

The BCG sits inside the upper receiver.

Pushing up on the upper receiver therefore pushes up on the BCG that is inside the upper receiver, and comprises part of the upper receiver group.

When the action is cycled, the BCG rides back and forth, starting completely inside the upper receiver, moving back so that part of the carrier is inside the receiver extension (which is part of the lower receiver group).

The BCG is then pushed forward out of the receiver extension, and back fully inside the upper receiver.

So, the BCG goes from upper receiver, to the receiver extension/lower receiver group, and back into the upper receiver.

During these travels, if the upper receiver and the receiver extension/lower receiver group are pushed out of alignment with each other in some way (like possibly an Accu-Wedge), the tail of the carrier can rub against the top of the receiver extension.

I can confidently assert that I have seen this happen. I’m sure there are some folks at Colt that have seen this happen. I’m not saying that it WILL happen, but I am stating that it CAN happen, and that I have SEEN it happen. In that instance, removal of the offending Accu-Wedge corrected the issue and the carrier no longer rubbed against the receiver extension.

PS:
Part: an individual component

Assembly: a collection of two or more parts

Group: a collection of two or more assemblies

 

[cmshoot]

Mike Mihalski, owner of Sons Of Liberty Gun Works, admits that within spec, upper and lower fit have no bearing on accuracy or reliability.

He also states that at SOLGW they pride themselves on their upper to lower fit, but strictly as bragging rights on the tight tolerances that they keep their machining to, and that it is no way related to their reliability and accuracy claims.

 

[TuckerCarlson]

If trimmed properly I don't see how they push the BCG up since they sit under the rear take down pin lug. Pushing up against the steel take down pin is a lot of force exerted by a piece of silicone.

Pushing up against the rear takedown pin is shifting the Upper… the BCG is in the upper… therefore the BCG is moving too

 

[cmshoot]

Pushing up against the rear takedown pin is shifting the Upper… the BCG is in the upper… therefore the BCG is moving too

Is that kinda like if the plane crashes, everyone that’s on the plane crashes with it?

 

[TuckerCarlson]

K
Thatsnallllaáoà91jj
You seem to know more than Colt does. Now that's confidence! And Wilson Combat.

I can unequivocally state that Colts assembly of their LE6920’s is about on par with a Philippino worker producing RockIsland 1911’s. I had the unique experience of disassembling 200 factory LE6920’s for Cerakote. From improperly torqued castle nuts, loose barrel nuts, improperly timed RE’s and a plethora of other issues I can say that Colts glory days are over. Also it doesn’t take a rocket scientist to figure out the AR platform, take the MilSpec TDP and ****ing run with it. Don’t try and re invent the wheel, don’t care about receiver fitment, make sure the gun is reliable and don’t mess with it.

 

[Burning Love]

I can unequivocally state that Colts assembly of their LE6920’s is about on par with a Philippino worker producing RockIsland 1911’s. I had the unique experience of disassembling 200 factory LE6920’s for Cerakote. From improperly torqued castle nuts, loose barrel nuts, improperly timed RE’s and a plethora of other issues I can say that Colts glory days are over. Also it doesn’t take a rocket scientist to figure out the AR platform, take the MilSpec TDP and ****ing run with it. Don’t try and re invent the wheel, don’t care about receiver fitment, make sure the gun is reliable and don’t mess with it.

This made my hands hurt

 

[cmshoot]

This made my hands hurt

Pain in the pursuit of knowledge is good for your soul.

 

[Deleted member 97214]

So the silicone piece distorts(bends) the upper receiver and makes the BCG rub?

Is that what I'm hearing?

 

[cmshoot]

So the silicone piece distorts(bends) the upper receiver and makes the BCG rub?

Is that what I'm hearing?

No. That is not what I said. I described it thoroughly in Post #31.

Also, I stated that the phenomenon that I described “can happen”, not “will happen”.

 

[Deleted member 97214]

No. That is not what I said.

Also, I stated that the phenomenon that I described “can happen”, not “will happen”.

Yea you said "pushes up". Just trying to clarify.