I want to use a Harris bipod on my RRA AR. It has the RRA TRO-XL Free Float handguard. What are you all using that works well for putting a straight sling swivel stud on a Picatinny rail, or a bipod-specific adapter? I've done some research and see there are a lot of options. I'm not looking to break the bank, just get something that's functional and works well. Thanks in advance