$650
I dont know how to price it so I got this from gunbroker.
This is not thread crapping, but since you said you have no idea how to price it I’m going to offer a little guidance. The model you posted from gun broker is is not the same model you have, and has not sold at that abnormally high price.
You gun is used, and permanently modified in a way that probably only appeals to you....which typically will affect the value.....
That being said, below are a few recently COMPLETED auctions (read: the price they actually sold for not some inflated price somebody is hoping to get for one) of brand new Unmodified Tac-14’s that are the same model as yours. Again, bear in mind these are NEW and UNMODIFIED which typically would carry a higher value.
I hope this helps. Good luck with your trade