That's what I'm afraid of. The bolt lift is hard and I can barely get the collar and pin on/off. When cocked, all the coils are touching each other. uncompressed length is 4 1/2" but I didn't measure the wire dia.
Not to be insensitive..but if you really believe this is the issue why not just buy a NOS USGI spring? You can buy them all day long on eBay for about 8 bucks. Skip a couple beers the next time you’re out to dinner and you’ll be money ahead.