This is a USGI TRW trigger group for the Springfield M14 rifle. It features the "TWR" marked trigger housing and "SA 5546008" marked hammer, other parts do not appear to be marked and there is no safety included. Overall condition is good with typical wear you'd expect from a vintage USGI M14 part. This would be a great item for anyone looking to turn their M1A into a semi-auto M14 clone. Buy online today!