I bought a Varminter a year and a half ago. I had one years back was was amazingly precise. I wish I'd know about the steep drop in quality after Remington bought them bit it can't be helped. This one is just slightly better than my classic iron-sighted A2. Today it put together a nice 4moa group at 100 yards. Not 0.4, 4. So, I figure the barrel has to go as a first step toward precision. Are there any pitfalls to watch out for in doing a swap?