Just put an Aftec extractor in my Baer and it works great! No tuning required. Just slip it in once the length is fitted and shoot away! The extractor itself is very burly. Tension is created by two coil springs. I ran 300 rds through my TRS and it finally worked fine. My local smith has over 25,000 rds on his Aftec. Anyone else using one of these?