i had both noveske NSR and JP (i was the one selling it and its now sold) . i perfer the NSR between the two for comfort but its mounting system is not as great. that being said the JP is solid as a rock. its build towards precision shooting to keep the rifle steady. there is almost no flex at all . but definitely heavier . cheaper option would be troy alpha rail(worse mounting system of all that i mentioned.) and samson(best value). ive own them all and they all great. comes down to how you use the rifle and amount u wanna spend.