I purchased these as a replacement set for my TSD ICS PCR-97 M4, which does have a delta ring assembly. However, the delta ring assembly is different than real deal; the barrel nut has no teeth, but 2 tabs on the sides. This basically renders it useless as of just yet, but that is my fault for not looking into it further beforehand. Although, I have ordered a real delta ring assembly and barrel nut, and will be attempting to make this work out. I just hope my upper receiver is threaded standard so I don't have to rethread it forcefully. Just thought I would throw this out there as a precautionary warning fot those looking to upgrade to these and are not sure. Be sure to check your delta ring and barrel nut to make sure it has the teeth before buying these, unless you plan on getting a new delta ring assembly and barrel nut. Also, I purchased the VFG to go along with this, and they seam to make a nice pair. I highly recommend
option to mount rails if needed
VFG mount optional
stylish and BA looking
fault of my own, but some delta rings and barrel nuts are incompatible with this type handguard
overall no other cons, except pricing is higher than the real deal, which you could remove the heat shields from.