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Mega Arms Side Charging Receiver/Troy Handguard Issue

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The way I see it it's either cut off the nub that keeps everything lined up, or cut a notch in the receiver. What do you think, Interwebs?

 

It would seem that this receiver is designed for a delta ring and two piece handguard. For a reference as to what it's supposed to look like, look at how the black handguard fits on a normal receiver.

 

IMG_34601.jpg

 

IMG_34611.jpg

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Could you have the upper receiver machine to accept the hand guard or machine the nub off?

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Could you have the upper receiver machine to accept the hand guard or machine the nub off?

 

I don't think I can remove the nub because I think it keeps the barrel nut from backing off but I'm hesitant to alter the upper receiver like that.

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Billet upper? I have the same handguard on one of mine with a forged upper and have no issues with the nub. Smarter people than me will be along shortly.

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I'd just call Mega, I'm sure they've seen this before and will advise the best option

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I don't think I can remove the nub because I think it keeps the barrel nut from backing off but I'm hesitant to alter the upper receiver like that.

Wait a minute! WHAT? I don't think that nub has anything to do with keeping the barrel nut tight.

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That is an alignment and anti rotation nub, take it off and have the upper notched.

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