i have to say my trust with sw front line office blocker has been less than pleasant. had to send a new mp10 that cost over 1800 buc to sw for which they had longer than myself 4wks to repair a non cycling issue just it bac 0n 28 feb. their was no explanation of what work had been done tried jackin a round and couldn't get it out this was a new problem when i finally did get it removed noticed heavy scares on the hornaday whitetail 150gr caseing any advice as to whom i can talk to and get some help cause it aint the ones i have dealt with so far. i do have four other sw guns with no issues ever, my ar10 is a core which has performed perfectly. right now i little trust with sw, but hay i didn't build the gun.