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Posted: 1/12/2015 3:49:44 PM EDT
| I am working on a new LR308 build in .338 Fed and am trying to decide on a good upper for it. I will be using a JP LMOS so have no need for a forward assist in the upper but would still like a shell deflector. I am looking at the Tactical Machining upper or Juggernaut Tactical upper. Anyone know of any other options for a LR308 style upper with just a shell deflector and no forward assist? |
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CMMG has very lightweight, no FA uppers with deflector.
Also think about the gas system signature and pressure curve of .338 Federal, and what that means for your barrel length, port location, and port size. Since there is very little bottle neck, we are dealing with faster-burning powders, so the port pressures can be lower than you would expect. Using the JP LMOS for that is actually a good idea in this case. |
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Quoted:
CMMG has very lightweight, no FA uppers with deflector. Also think about the gas system signature and pressure curve of .338 Federal, and what that means for your barrel length, port location, and port size. Since there is very little bottle neck, we are dealing with faster-burning powders, so the port pressures can be lower than you would expect. Using the JP LMOS for that is actually a good idea in this case. Thanks for the info. I will definitely keep CMMG in mind as I rarely hear anything bad about their products. Fortunately for me I am a gunsmith by trade so I have some experience with the AR-15 platform and tuning (ok more like a few years  ). I am just getting into the LR308 so figured I should build one for myself to play with some of the options.
Still trying to find some of those hidden gems to possibly play with on this build. I figure the boss would appreciate having something new and interesting in the custom build showcase at work for customers to look at, plus I just can't help but want to play with some new toys. |
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My recommendation is to use matching receivers from the same manufacturer, after determining that all the critical components and ancillary parts you desire will fit with them.
That in and of itself is more of a challenge than assembling the parts, because the AR10 world is all over the map. Almost nothing they teach in the gunsmithing schools really applies to these rifles anyway, except accurizing tricks and basic work like threading, chambering, blue-printing, and some fire control principles maybe. |
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Almost nothing they teach in the gunsmithing schools really applies to these rifles anyway, except accurizing tricks and basic work like threading, chambering, blue-printing, and some fire control principles maybe. I know what you mean. In school our coverage of the AR went something like this. "This is an AR-15, a semi-auto civilian version of the M16 and is made of plastic. Now on to lever action rifles." |
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