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Posted: 9/19/2009 2:04:47 PM EST
Just got my BCM upper assembled to a Spike's Tactical lower. There is a little play between the upper and lower halves.
I do not have a rear sight, yet, but will probably be ordering one on monday..
I want to break in the SS barrel tomorrow without the rear sight if I can fiigure out the small rubber ring that came with the complete BCM BCG.
What is the small rubber ring for? Is it a spare?
Thanks.

How much play is OK between the upper and lower halves.
Link Posted: 9/19/2009 2:07:36 PM EST
It goes around the extractor spring. I don't know if it's a spare or not. I didn't take my bolt apart, it rus fine as is so I'll find out when I clean it, eventually.
Link Posted: 9/19/2009 2:11:38 PM EST
It is not a spare, they don't come with one installed, I'd shoot it without it, 99% chance it will funtion great without it.
Link Posted: 9/19/2009 2:21:34 PM EST
[Last Edit: 9/19/2009 2:23:57 PM EST by Captains1911]
It's not a spare, they just don't install it because it really isn't needed. You know it's extremely easy to just take the extractor off and look for yourself.

Regarding play between upper and lower: http://www.ar15.com/forums/topic.html?b=3&f=118&t=460632
Link Posted: 9/19/2009 3:30:40 PM EST
And it is a pain to install
Link Posted: 9/19/2009 3:35:33 PM EST
Originally Posted By FrozInAK:
And it is a pain to install


Link Posted: 9/19/2009 4:29:23 PM EST
Not needed....ensures higher reliability if you're going to fight with it. Most of us don't plan that much "fun".
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