A-bolts are utility rifles. They are not for making custom rifles. They work without having to buy or put money into it. I have an Abolt-II and it will put any factory soft point under an inch, some under 1/2 inch.
As far as the bolt goes, I can take it apart for cleaning in about 10 seconds with just a leatherman or a needlenose plier. The only problem is changing the ejector or the extractor.
An A-bolt isn't as robust as a model 70, but it's a good alternative for a light rifle.