I just watched the videos of the barrel removal and installation, and it was a snap. Easier than I thought it would be. I am curious about a few things:
1) I noted that there was some thick-ish grease type lubricant, or something, on the exterior part of the barrel surrounding the chamber, that is engaged by the trunion. I didn't remove it... does this stuff have to be there? What is its function?
2) I like how the barrel nut never actually gets "loose" even when it is backed out... makes me think it will not easily shoot loose. However, when reinstalling the barrel, after the nut was "hand tight" (I take this to mean, once it encounters a little more resistance from the minimum as far as torquing it down) it would not turn another 70 degrees. So, I basically just torqued it down as tight as I could by hand. I'd say it was only about 30 degrees past the first "hand tight" spot. Is that alright?
3) How does the headspace work in this rifle/how do I know the barrel is truly seated properly? I did make sure to pay careful attention to the orientation of the gas block with relation to the upper, and matched it upon reinstallation, but as we know, headspace can be measured in thousandths.
4) In one of the videos, they talk about orienting the holes in the gas tube down for normal conditions, or up for shooting in "a sandstorm or muddy water"... what is going on there? Can someone expand on that a little?
Thanks.
1) I noted that there was some thick-ish grease type lubricant, or something, on the exterior part of the barrel surrounding the chamber, that is engaged by the trunion. I didn't remove it... does this stuff have to be there? What is its function?
2) I like how the barrel nut never actually gets "loose" even when it is backed out... makes me think it will not easily shoot loose. However, when reinstalling the barrel, after the nut was "hand tight" (I take this to mean, once it encounters a little more resistance from the minimum as far as torquing it down) it would not turn another 70 degrees. So, I basically just torqued it down as tight as I could by hand. I'd say it was only about 30 degrees past the first "hand tight" spot. Is that alright?
3) How does the headspace work in this rifle/how do I know the barrel is truly seated properly? I did make sure to pay careful attention to the orientation of the gas block with relation to the upper, and matched it upon reinstallation, but as we know, headspace can be measured in thousandths.
4) In one of the videos, they talk about orienting the holes in the gas tube down for normal conditions, or up for shooting in "a sandstorm or muddy water"... what is going on there? Can someone expand on that a little?
Thanks.