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The STNGR RPTR AR15/M4 M-Lok Free Float Handguard will be compatible with your M&P-15 but you will need to remove your delta ring, handguard cap, and fixed front sight or railed gas block if you have one. You would then need to purchase and install a low-profile gas block.
The STNGR RPTR M-Lok Free Float Handguard for AR15/M4 will not fit billet upper receivers without modification. The Gibbz Arms Side Charging Handle 9mm upper is also not compatible with handguards that have anti rotation tabs unless they are removed.
Yes, you will need to replace the A2 front sight gas block with a low profile gas block in order to install the STNGR RPTR M-Lok Free Float Handguard for AR15/M4.
Yes, you will need to replace the A2 front sight with a low profile gas block for the STNGR RPTR M-Lok Free Float Handguard for AR15/M4 to work on a Smith and Wesson M&P Sport 2.
The STNGR RPTR M-Lok Free Float Handguard for AR15/M4 is compatible with low profile gas blocks. So if you have a an A2 style gas block it would need replaced.
The STNGR RPTR M-Lok Free Float Handguard should fit but if you have a Billet Upper there may be some modification required according to the manufacturer.