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bcm upper
BCM theory, BCM synaptic modification, or the BCM rule, named for Elie Bienenstock, Leon Cooper, and Paul Munro, is a physical theory of learning in the visual cortex developed in 1981.
The BCM model proposes a sliding threshold for long-term potentiation (LTP) or long-term depression (LTD) induction, and states that synaptic plasticity is stabilized by a dynamic adaptation of the time-averaged postsynaptic activity. According to the BCM model, when a pre-synaptic neuron fires, the post-synaptic neurons will tend to undergo LTP if it is in a high-activity state (e.g., is firing at high frequency, and/or has high internal calcium concentrations), or LTD if it is in a lower-activity state (e.g., firing in low frequency, low internal calcium concentrations). This theory is often used to explain how cortical neurons can undergo both LTP or LTD depending on different conditioning stimulus protocols applied to pre-synaptic neurons (usually high-frequency stimulation, or HFS, for LTP, or low-frequency stimulation, LFS, for LTD).
Back up for sale. Looking for 1540$
Sling and mag are not included.
Would consider a trade for a g34 gen 5 or a g17 gen 5
Quality bolt action rifle
Open to other trade offers
Sorry, this item has sold
BCM upper receiver w/dust cover and forward assist (has laser etched BFH and BCM logo)
This is a pull-off that came from a complete upper that was repurposed, it was never put on a working lower and is in brand new condition.
I will offer a discount to someone who...
For trade is a 20” BCM upper with MCMR handguard. Brand new, 0 rounds down the barrel.
Looking to trade for Vortex Binoculars or a Stribog. Hit me up with offers.
Sorry, this item has sold
BCM upper receiver with Lantac forward assist and Strike Industries adjustable dust cover
New components and never fired.
Please pm for any questions.
I take PayPal friends and family
Shipping OK, S/H $4.99
No separate parts purchase requests please.
No trade...
Used in more of a DMR role. (Using other glass 😊). Roughly 500 rounds through it. I was able to achieve MOA groups with frontier 75 gr.
Upper:
Purchased complete roughly 2 years ago from BCM. Mk2 upper (supposed to help rigidity/accuracy) 16” BFH (cold hammer forged) barrel. Bcm bolt...
In like new condition,
This is a pull off but never saw any range time.
Never mounted on a lower.
Has BCM logo laser etched on the upper.
Has strike industries adjustable dust cover
Has standard BCM forward assist
I take pp friends and family
No trade request please
please PM me for any...
Parting out BCM upper [ receiver, barrel with low pro gas block, mid-length gas tube, handguard, BCG, and charging handle. ]
Parts will be marked as new or used
1. Complete upper BCM receiver (with Strike industries enhanced dust cover and standard forward assist) $100 (NEW)
SOLD...
Selling a lightly used BCM 14.5 upper that was purchased four months ago. This upper is the normal, non-BFH enhanced lightweight upper. Chrome bore. No BCG or CH, flash hider is not pinned and welded. All parts lightly used, as in the upper has had less than ten rounds through it. Nothing wrong...