I'm relatively new to Nerf. I only bought my first blaster (a Recon) about a month ago. I have since removed the AR, changed the spring for another i had made which has a 50% increased load, padded the plunger and integrated a laser into the front of it.
I also have a Mav with AR removed and a NF with AR removed and a Alum barrel.
I am also making a replica "Han Solo blaster" from a modded NF for a mates birthday.
Next step is to buy a LS and mod that.
Edit: I have also re-enforced the recon stock with aluminium tubing. I didn't like the way that the plastic one flexed whenever it was touched