It's for a good cause... and I am not actually looking for money (But I won't turn anyone down if they insist ). I am trying to start compiling pictures of barrel markings and lower receivers (and their roll marks) for my AR15 blog. Something like these: DPMS Stripped Lower Common Colt barrel markings, this is a Colt 1/7 twist chrome lined govt profile 20" barrel You are essentially granting me permission to post your picture on my blog. If you have anything to donate, it would be appreciated. It's just an informational post I will be doing about common rollmarks and barrel markings. You can post them here or email them to me (email@example.com). Very interested in anything that could be considered uncommon. I already have DPMS, Stag, LAR (with the honeycomb, not the bear), CAV ARMS MKII, and the newer RRA logo lowers. Also, any barrels with or without markings would be helpful. Be sure to give me as much information/description on the picture as possible. Thanks for anyone who cares to help out.