its light but i had a hell of a time putting it on. like the receiver tabs interfere with the selector plate and plastic washers on the gearbox. the retainer pin holes r tight (use force to get them in) and the ejection port cover had 2 piece (the little square tab thingy) and it wouldnt stay in (might need superglue). all that took almost 2 hrs also the magwell is pretty tight and wont fit one of my G&P mags