I have a 450 bushmaster carbine flat top and I need to attach a front sling swivel,was wondering what would be my  best option. Thanks in advance

I just went for the M-lok swivel mount and Magpul Paraclip for my LE6920 MPB.   They make a mount for a rail as well.   What I read was better off with a Paraclip type front mount vs a QD so it does not ever release under tension.   Also gives you the option of sling mount out as far as possible for leverage and stance tension.   I stuck w the QD clip on the stock as it came w the rifle.  I went w a VTAC bungee as my first sling, Blue Force as second choice.   Will see how it works out.

SIG SAUER Low Profile QD Socket 1913