BCG Tool Marks

[pyzik]

I picked up a lightly used rifle this summer (BCM upper, BCM BCG, Mega lower). The BCG had been NiB'd so no BCM logo but the rifle was coming from a pretty trusted source so I felt pretty comfortable with the buy.

Now, I'd almost NO AR experience before the buy. Just what I'd researched over the few months leading up to the final decision.

Are these tool marks normal? Most BCGs I see are "smooth". (I know that the forward assist cuts that go a little low IS normal).

https://lh4.googleusercontent.com/-JmMFxf1TFVY/UurNNKQ1l9I/AAAAAAAABFo/7EzmbAsOzQ8/w1260-h709-no/IMG_20140130_154456_151.jpg

https://lh5.googleusercontent.com/-BqnXoUaC81E/UurB_dYLsGI/AAAAAAAABFU/y04MIDiDi2s/w1260-h709-no/IMG_20140130_161757.jpg

https://lh4.googleusercontent.com/-94Nq-2gGLFE/UurMX_Y0CCI/AAAAAAAABFg/D61A3-c5E9Q/w1260-h709-no/IMG_20140130_161905.jpg

Thank you gentlemen!

[Airhasz]

Looks fine to me. As long as it is lubed, slides free in the upper I'd have no problem running it.

[Ryno12]

Not sure if the machining marks are normal in general but I would say that they're not normal for BCM BCGs. The key looks similar to their staking but I'd be surprised if that carrier passed their QC.
Does it run good? If so, keep it. If it bothers you, buy an OEM from BCM and use this one as a spare or sell it during the next panic.

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[wahoo95]

Nothing wrong with it

[mpom]

Main reason its nothing to worry about is that the carrier primarily contacts the inside of upper receiver via the narrow raised "rails". One each on either side of key, two more below hole for cotter pin. They look OK in your photo.

[Toddler]

There's nothing wrong with it. It's just when you NiB coat a BCG it shows everything a whole lot worse than phosphate. I've seen a lot worse than that. If your wanting pretty a Young chrome or a JP are about as smooth as there is. Neither are NiB coated but the JP I've had are the absolute nicest out there, but very expensive.

[Ryno12]

Unless I misunderstood the OP, he asked if it's normal not if it will work, correct? I didn't read that he's concerned about the operation of it but more if it's an actual BCM BCG.

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[pyzik]

Correct. It operates fine. Havesnt put a lot of rounds down range but all have been fin (500 maybe).

I was just looking at another BCG (unknown brand) and it seemed much smoother.

Maybe it is the NiB. I just got my M&P9c NiB'd and all the markings do indeed stand out more.

[Iraqgunz]

There's nothing wrong with it. You're worrying about nothing.