Yes, they are m-lok compatible
The DoubleStar National Match Free Float Standard Handguard is 12.585" in overall length.
The DoubleStar National Match Free Float Standard Handguard is not M-LOK compatible or compatible with any accessories such as bipods, picatinny rails etc.
No. The DoubleStar National Match Free Float Standard Handguard will not work because of the barrel nut size difference between the AR-10 and AR-15, the handguards and rail systems are not interchangeable. I would recommend using the M5 handguard found using the following link
https://www.opticsplanet.com/aero-precision-m5-enhanced-m-lok-handguard.html
The DoubleStar National Match Free Float Standard Handguard has vents at the end of the handguard that are not timed. Depending on your rifle the vents in the rail could line up just right and you would be able to use a Harris bipod adapter. However, since it is not timed, it may not line up that way for you.
No. This DoubleStar National Match Free Float Standard Handguard AR415 is designed for the AR15 platform and not the DPMS AR10 platform. You would need a high profile DPMS rail system. I will link a category of compatible rails below:
https://www.opticsplanet.com/s/dpms-handguard?_iv_categories=handguards-and-forends&_iv_gridSize=240&_iv_parent-gun-make=dpms
The DoubleStar National Match Free Float Standard Handguard is 12" long. With an outer diameter of 1.98" and an internal diameter of 1.74".
No. It is for the AR-10.
Yes, Barrel nut and tube fits most barrels
Please email us at techsales@opticsplanet.com so we can further assist you with your question.