The Caldwell XLA External Spring Shooting Rifle Bipod mounts via a sling swivel stud. Since the M&P-15 does not use a sling stud you would need to purchase and install one on your rifle. You would first need to replace your standard handguard (if you have a 2-piece) with an aftermarket M-lok or picatinny handguard. You would then need to purchase a sling swivel adapter. Email us at Techsales@opticsplanet.com if you need assistance in selecting the correct parts to mount this bipod to your rifle.
This model is not compatible with M-Lok
The Caldwell XLA External Spring Shooting Rifle Bipods - Pivot Position will fit the sling swivel stud on that adapter.
Caldwell products have a 1 year limited warranty. It should work with 300 Win Mag without issue.
These bipods require a sling swivel stud to mount. If you do not already have one on your 10/22 Takedown, you would need either a barrel band with a swivel on the bottom (which unfortunately we do not currently have) or you could add one to the stock with a screw-in option.