I have a set of brand new, never used KAC micro sights for SPF. These will run you over $300 if you can find them in stock: http://www.weaponoutfitters.com/tactical-optics/iron-sights/kac-buis-front-rear-combo-set.html
These are NOT the USMC branded ones.
Terms
Free shipping via USPS. Discreet PayPal (gift or you cover fee) and USPS MO are preferred methods of payment. No insurance provided, but available at additional cost. I have excellent feedback on both this site and on TOS (over 200) so rest assured these are as described.