Because lightweight is easier to drive from target to target. It's also good to use when teaching females how to shoot an AR because they tend to lack the upper body strength so a 7lb AR gets distracting/tiring for them to hold up much more quickly.
I've owned TN Arms poly lowers since they were first released, and have beta tested the product over multiple revisions (the current one has ironed out all significant issues I've found and reported). I have full confidence these are strong enough lowers and have run my 5.5lb gun (including optics & accessories) with it through a couple carbine classes.
Frank Proctor has ~10K (probably more now) on his TN Arms lower with no issues.
TN Arms is very easy to work with and if they come out with a newer revision of the lower, you can exchange your current one for free (well, you'd pay to ship it there, but that's it).
I've owned TN Arms poly lowers since they were first released, and have beta tested the product over multiple revisions (the current one has ironed out all significant issues I've found and reported). I have full confidence these are strong enough lowers and have run my 5.5lb gun (including optics & accessories) with it through a couple carbine classes.
Frank Proctor has ~10K (probably more now) on his TN Arms lower with no issues.
TN Arms is very easy to work with and if they come out with a newer revision of the lower, you can exchange your current one for free (well, you'd pay to ship it there, but that's it).
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