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Posted: 11/22/2007 8:38:39 PM EDT
I was wondering if there was a major difference functionally between these two. Obviously it would be used to change out barrels/forearms. And 
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I have the clamshell style from Brownells. I wish I had the other (bottom pic) instead. It works great, but it can leave faint marks on the receiver. I've since learned to use a piece of old shirt to line it with. See a square shape right above the bolt release. That's from the clamshell.  Yes, this is one of NoDak's 601 uppers. Isn't it sweet. 
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| Ill stick with the first. The marks are barely noticeable and if you put in a peice of cloth it doesnt occur. Ive heard of people twisting their uppers with the second one. Never seen it done and its only hearsay but thats what Ive heard from reputable gunsmiths. |
| I like the clamshell type because I am uncomfortable with putting a bunch of torque on the push pin holes in the upper receiver. I had one factory assembled Bushmaster upper that was WAAY over torqued. I had to wack the wrench with a hammer to get the barrel nut to break loose! I would not like to try that with the lower block pictured. |
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I own the Panther Block and did my first complete upper with it ( 1/7 Bushy SL on A2 ). Happy with outcome , my tax time Bushy upper has the square marks all along the upper both sides. The Panther is top notch, very good value. The panther is cnc'd, Clam shell molded. |
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