Overview Reviews Product Description The BCM Extractor Spring is a heavy coil design made for the increased extractor tension required on many AR15, M4, M16 short barreled rifles. This product also improves the reliability on a standard 16'' and 14.5'' carbines. Product Videos Custom Field Product Reviews Write a Review Write a Review × Bravo Company Usa Bcm Extractor Spring Upgrade Kit Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Email * Review Subject * Comments *