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Old 04-30-2010, 12:26   #1
faceplant
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Changing upper reciever

I have a Colt H-BAR with carry handle. I will be changing out the upper reciever for a flat top keeping the 20in barrel. I have ordered an upper assembly with parts but no bcg as I will be using the colt bcg. Do I need to check the chamber or will it be adjusted already?
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Old 04-30-2010, 15:33   #2
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If you keep the same bolt and barrel combination the headspace will not change so you are good to go.
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Old 04-30-2010, 18:30   #3
faceplant
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So your saying that if I get an extra BCG say from Bravo Company that I would not be able to use it in different ARs without worrying about headspace?
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Old 04-30-2010, 19:08   #4
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Most bolts are close and will not pose a problem but CMT/Stag are known to be on the large side, LMTs are known to be on the small side. If you use a Stag bolt in a LMT barrel most will be tight headspace, use a LMT bolt in a Stag/CMT barrel and there will more than likely be too much headspace. I have no idea who BCM buys their bolts and carriers from.
Also swapping back and forth is not a good idea because the lugs of the bolt get mated to the lugs of the extension, they should be flat but nothing is perfect. I would buy a bolt for each barrel and keep them together.
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Old 05-01-2010, 06:22   #5
faceplant
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Thanks
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Old 05-05-2010, 15:02   #6
faceplant
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I changed out the upper reciever. The gas tube was big pain in the backside. I had to use a set of pliers to grip it and bang that with a hammer. Any tips for the next one?
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Old 05-05-2010, 20:46   #7
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installing the gas tube in the gas block, including the roll pin?
They make a GB jig, little plastic tray but, I just lay the GB in the vise align the hole and use a roll pin starter. It looks like a long punch but has a hole in the end to hold the roll pin. Then slide the assembly over the barrel and through the hole in the receiver.
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Old 05-06-2010, 19:23   #8
faceplant
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Getting it out of the front site post while taking it apart.
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Old 05-07-2010, 00:09   #9
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If I have to pull them apart I clamp the tube in a vise and pull the f-sight base or gas block off.
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