Magpul ubr + delton lower = problems - Page 3
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Old 05-18-2012, 04:23 AM   #21
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You are partially correct...the DTi lower was probably a little out of spec...as was the UBR. Its called tolerance stacking. The lower has a small hole indent where a receiver end plate or A2 stock fits in. The UBR and lower just didnt fit together properly without a good slap/tap to seat them.

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Old 05-18-2012, 04:28 AM   #22
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Quote:
Originally Posted by Fixer View Post
You are partially correct...the DTi lower was probably a little out of spec...as was the UBR. Its called tolerance stacking. The lower has a small hole indent where a receiver end plate or A2 stock fits in. The UBR and lower just didnt fit together properly without a good slap/tap to seat them.
That's actually a great explanation and makes a lot of sense.
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