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Posted: 11/2/2012 5:01:13 PM EDT
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Is it normal that the BCM BCG that I just got in the mail isn't centered in the upper? See below:
BCM BCG Misaligned: 
Random BCG Aligned: 
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I haven't fired it yet. Still waiting for some parts to arrive.
I'm not sure why it doesn't seem clear, but you can see the space around the BCG (black area) in both pictures. The point I was trying to illustrate is that the BCG I have in my other rifle sits perfectly in the center of the upper and has no real chance of rubbing in places that it shouldn't. I tried both BCG's in both rifles with the same results in each, so I know it's not the upper that's causing my concern. The BCM BCG is a lot closer (maybe touching) in the 7 o'clock area. Since it seems to be offset in the opposite direction of the extractor, could it have anything to do with the "stronger" bolt construction of the BCM? |
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Quoted:
I haven't fired it yet. Still waiting for some parts to arrive. I'm not sure why it doesn't seem clear, but you can see the space around the BCG (black area) in both pictures. The point I was trying to illustrate is that the BCG I have in my other rifle sits perfectly in the center of the upper and has no real chance of rubbing in places that it shouldn't. I tried both BCG's in both rifles with the same results in each, so I know it's not the upper that's causing my concern. The BCM BCG is a lot closer (maybe touching) in the 7 o'clock area. Since it seems to be offset in the opposite direction of the extractor, could it have anything to do with the "stronger" bolt construction of the BCM? Your pictures are shot from a wide angle which induces distortion, and they are not from the same viewpoint meaning I can't tell what is or isn't going on. You also didn't answer how the weapon cycles (you can cycle it by hand), which makes being able to diagnose anything pretty much impossible at this point. Have you done a function check? We can only guess without more info, but that isn't helping you at all. Regarding your comment of the BCM being stronger, I have no idea what you mean with that part. The BCM BCGs are milspec. |
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2 BCM BCG's
http://i45.tinypic.com/fnws1x.jpg http://i50.tinypic.com/124bk1t.jpg http://i48.tinypic.com/2cik4xt.jpg I'm pretty sure when there's a round in the chamber the bolt itself wont have any play in it. |
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It hand cycles fine and functions normally, from what I can tell.
When I say the BCM BCG is "stronger," I mean the spring tension and overall build quality is better, higher, whatever, than my other BCG that has had who knows how many rounds through it. That probably has nothing to do with it, I was just asking. I'm not an expert on any of this, which is why I may be asking dumb/irrelevant questions and why I'm also looking for problems that may not be there. I just wanted to make sure because I don't want to break anything or wear out any parts prematurely because of improper alignment. So everything is normal then. Thanks for the help. I'm going to go work on my photography skills now... 
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Quoted:
It hand cycles fine and functions normally, from what I can tell. When I say the BCM BCG is "stronger," I mean the spring tension and overall build quality is better, higher, whatever, than my other BCG that has had who knows how many rounds through it. That probably has nothing to do with it, I was just asking. I'm not an expert on any of this, which is why I may be asking dumb/irrelevant questions and why I'm also looking for problems that may not be there. I just wanted to make sure because I don't want to break anything or wear out any parts prematurely because of improper alignment. So everything is normal then. Thanks for the help. I'm going to go work on my photography skills now... Your question isn't dumb at all, I hope my replies didn't insinuate that. When it comes to firearms, it is much better to ask a question, than to pull the trigger on something which has even a little possibility of being unsafe. In the case of this, cycling the weapon answers the question for us as the other guys have already noted. 
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