cwlongshot wrote:I just went thru this myself.
IMHO YES, ya need a more open port For reliability. Im lucky in that I have access to a Mill & Bridgport. I used a bridge port and a 3/8 & .630 end mill.
Just a few passes on each side. I choose to omit the door. But it can be retained by only opening FORWARD of its contact point then entire bottom of port. I opened top to shadow line at the top then bottom to line scored off door. Took maybe 15 minutes then 30 more carefully removing the "knobs" that held the door. Last a couple
Coats of alumi black and it was a invisible modification.
Im certain its been done with a dremil and files. Id just recomend NOT TO RUSH and be of proper state of mind not rushed or tired or fatagued. Its something thats gonna be very obvious if ya fudge or ham hand it.
Maybe ask around buddies and see if they have access to a mill or bridgeport. Its quick and easy.
You could also just buy a spec 450/458 upper.
GOOD LUCK!
CW
Plus one on the "not to rush" part.
I was in NO hurry. Taped the livin' hell outta the parts that needed keeping.
If I did a plumbing job that bad, I'd go back to retreading.
Thankfully it was a $39 PSA stripped lower.
I'm SO ashamed...
Dremel... 1 star. Do not recommend.