Endless really you would need a sling mount on the TRX rail & the stock has a QD mount on either side !! Options below sling plus QD mounts or QD at rear of stock & just the sling using option 2 & 3
Option 1
https://troyind.com/products/trx-sling-adapter
Option 2
https://troyind.com/products/rail-section-qars-2
Option 3
https://troyind.com/products/combo-mount