Quoted: From what I gather, this is the order of operations when building a receiver.
1. Rivet mag catch/trigger guard 2. Use a magazine to test-fit the front trunion location. Once you have a good setup, drill and rivet/screw. 3. Once the front trunion in place, use your dust cover to align the rear trunion. 4. See what's left on the front and/or rear of the OOW receiver, then trim it.
Personally, I like this option much better. I was so bummed with the pre-drilled holes of the Vulcan/Tapco flats that I gave up on them. I'd fit the mag catch in the holes, then test a mag to fit, and the front tunion holes were off! Sucks...I'd rather trim/drill to fit.
take care, Tec
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I plan on doing a 74 kit after this, and I plan on doing it that way next time. My order was more like:
1) trigger gaurd (didnt rivet just used small bolts while mocking)
2) Inserted trunnion all the way, then inserted a magazine and let it slide back to give the mag a decently tight fit). Didn't drill of rivet
3) Mock up the rear, forgot to check dust cover length at this point. Assumed reciever was "spec"
4) Drilled rear, bolted it in place (temporary), function checked under folder. Everything good here.
5) Drilled front, and bolted it in place (temp).
6) Dropped bolt carrier assy and recoil spring in. Tried to install dust cover over the top. No go.
Awfully stupid of me to go the long route, and the way I did it. >.< Lesson learned. I will have a knowledgable person look it over before I scrap.