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cutt1100
9 January 2016, 13:12
I have a Wilson Combat barrel that measures 1.00 at the barrel extension. I have a Cross Machine Tool upper receiver that measures .990 at the barrel opening. Any suggestions. My first build. cutt1100 Thomson GA

alamo5000
9 January 2016, 13:34
Not sure where you are measuring from or which specific dimensions but putting up pictures might also help.

Fathom_Arms
9 January 2016, 13:55
So is the barrel extension sticking out inside the upper receiver? It should be flush. As stated, pictures would help.

BoilerUp
9 January 2016, 13:59
I presume you are talking about diameter dimensions. Use a heat gun to apply heat to the upper receiver. It will expand and let you slide the barrel right in.

UWone77
9 January 2016, 14:39
I presume you are talking about diameter dimensions. Use a heat gun to apply heat to the upper receiver. It will expand and let you slide the barrel right in.

This.

Or throw the barrel into the freezer. [:D]

Using a rubber mallet to help you tap it into the receiver is useful as well.

DutyUse
9 January 2016, 15:50
And don't forget to add a little grease to the barrel extension

cutt1100
12 January 2016, 08:31
Nothing wrong with Cross Machine Tool receiver. I measured it wrong (old eyes). With a little grease it slipped right in. Nicest looking upper and lower I have.