Razmuz, I have a Burris Signature 1.5x6 on my Ruger MKII .243 that should work (5.5" between bells). It's not a true compact scope but it would look good. The Pentax Lightseeker 1.5x6 has the same dimensions. (assembled by Burris with Pentax' glass) It has a smallish objective lens but is very bright in dim light, especially on low power. It is a very clear scope too. I've read the Nikon Monarch is not listed as a compact but one of the big name gun writers praises them for short action rifles. SWFA has the best prices on Pentax scopes. That's where I bought my 2x8 Lightseeker.